J/MNRAS/500/2359 HII region emission-line fluxes analysis (Zurita+, 2021)
Bar effect on gas-phase abundance gradients.
I. Data sample and chemical abundances.
Zurita A., Florido E., Bresolin F., Perez-Montero E., Perez I.
<Mon. Not. R. Astron. Soc. 500, 2359-2379 (2021)>
=2021MNRAS.500.2359Z 2021MNRAS.500.2359Z (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; H II regions ; Abundances
Keywords: ISM: abundances - HII regions - galaxies: spiral - galaxies: ISM -
galaxies: abundances - galaxies: structure
Abstract:
Studies of gas-phase radial metallicity profiles in spirals published
in the last decade have diminished the importance of galactic bars as
agents that mix and flatten the profiles, contradicting results
obtained in the 1990s. We have collected a large sample of 2831
published HII region emission-line fluxes in 51 nearby galaxies,
including objects both with and without the presence of a bar, with
the aim of revisiting the issue of whether bars affect the radial
metal distribution in spirals. In this first paper of a series of two,
we present the galaxy and the HII region samples. The methodology is
homogeneous for the whole data sample and includes the derivation of
HII region chemical abundances, structural parameters of bars and
discs, galactocentric distances, and radial abundance profiles. We
have obtained O/H and N/O abundance ratios from the Te-based (direct)
method for a sub-sample of 610 regions, and from a variety of
strong-line methods for the whole HII region sample. The strong-line
methods have been evaluated in relation to the Te-based one from both
a comparison of the derived O/H and N/O abundances for individual HII
regions, and a comparison of the abundance gradients derived from both
methodologies. The median value and the standard deviation of the
gradient distributions depend on the abundance method, and those based
on the O3N2 indicator tend to flatten the steepest profiles, reducing
the range of observed gradients. A detailed analysis and discussion of
the derived O/H and N/O radial abundance gradients and y-intercepts
for barred and unbarred galaxies is presented in the companion Paper
II (Zurita et al., 2021MNRAS.500.2380Z 2021MNRAS.500.2380Z). The whole HII region
catalogue including emission-line fluxes, positions and derived
abundances is made publicly available on the CDS VizieR facility,
together with the radial abundance gradients for all galaxies.
Description:
Compiled catalogue of 2831 HII region emission-line fluxes and
coordinates. The catalogue also contains the derived galactocentric
radius, physical properties (Te and ne) and the O/H and N/O abundance
ratios. These have been derived using a variety of strong-line
methods: HII-CHI-mistry, N2, O3N2, R23, N2O2 and the R
calibration for O/H, and HII-CHI-mistry, N2O2, N2S2 and R
calibration for N/O. Direct or Te-based abundances have been
calculated for a subsample of 610 HII regions.
The regions belong to a sample of 51 nearby spirals, for which we have
derived their radial 12+log(O/H) and log(N/O) abundance profiles. The
best-fitting parameters (abundance gradients, central abundances,
scatter, etc) are provided in the corresponding tables for all the
abundance methods used in this work.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
hiicat.dat 784 2831 HII region catalogue with line fluxes,
chemical abundances and positions
logno_r.dat 953 51 Best-fitting parameters for the radial log(N/O)
profile in the sample galaxies
logoh_r.dat 1460 51 Best-fitting parameters for the radial
12+log(O/H) profile in the sample galaxies
refs.dat 73 99 References
--------------------------------------------------------------------------------
Byte-by-byte Description of file: hiicat.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 30 A30 --- Region HII region identification (1)
32- 39 A8 --- Galaxy Host galaxy name
41- 49 F9.4 deg RAdeg Right ascension (J2000)
51- 59 F9.4 deg DEdeg Declination (J2000)
61- 70 F10.5 --- [OII]3727/Hb ?=-999.0 Reddening-corrected flux
in [OII]3727 line relative to Hbeta
72- 81 F10.5 --- [SII]4072/Hb ?=-999.0 Reddening-corrected flux
in [SII]4068,4076 relative to Hbeta
83- 92 F10.5 --- e_[SII]4072/Hb ?=-999.0 Uncertainty in [SII]4072/Hb
94-103 F10.5 --- [OIII]4363/Hb ?=-999.0 Reddening-corrected flux
in [OIII]4363 line relative to Hbeta
105-114 F10.5 --- e_[OIII]4363/Hb ?=-999.0 Uncertainty in [OIII]4363/Hb
116-125 F10.5 --- [OIII]4959/Hb ?=-999.0 Reddening-corrected flux
in [OIII]4959 line relative to Hbeta
127-136 F10.5 --- [OIII]5007/Hb ?=-999.0 Reddening-corrected flux
in [OIII]5007 line relative to Hbeta
138-147 F10.5 --- [OIII]/Hb ?=-999.0 Reddening-corrected flux in
[OIII]4959+[OIII]5007 relative to Hbeta
149-158 F10.5 --- [NII]5755/Hb ?=-999.0 Reddening-corrected flux
in [NII]5755 line relative to Hbeta
160-169 F10.5 --- e_[NII]5755/Hb ?=-999.0 Uncertainty in [NII]5755/Hb
171-180 F10.5 --- [SIII]6312/Hb ?=-999.0 Reddening-corrected flux
in [SIII]6312 line relative to Hbeta
182-191 F10.5 --- e_[SIII]6312/Hb ?=-999.0 Uncertainty on [SIII]6312/Hb
193-202 F10.5 --- [NII]6548/Hb ?=-999.0 Reddening-corrected flux
in [NII]6548 relative to Hbeta
204-213 F10.5 --- Ha/Hb ?=-999.0 Reddening-corrected flux
in Halpha relative to Hbeta
215-224 F10.5 --- [NII]6583/Hb ?=-999.0 Reddening-corrected flux
in [NII]6583 line relative to Hbeta
226-235 F10.5 --- [NII]/Hb ?=-999.0 Reddening-corrected flux
in [NII]6548+[NII]6583 relative to Hbeta
237-246 F10.5 --- [SII]6717/Hb ?=-999.0 Reddening-corrected flux
in [SII]6717 line relative to Hbeta
248-257 F10.5 --- [SII]6731/Hb ?=-999.0 Reddening-corrected flux
in [SII]6731 line relative to Hbeta
259-268 F10.5 --- [SII]/Hb ?=-999.0 Reddening-corrected flux
in [SII]6717+[SII]6731 relative to Hbeta
270-279 F10.5 --- [OII]7325/Hb ?=-999.0 Reddening-corrected flux
in [OII]7320,7330 relative to Hbeta
281-290 F10.5 --- e_[OII]7325/Hb ?=-999.0 Uncertainty in [OII]7325/Hb
292-301 F10.5 --- [SIII]9069/Hb ?=-999.0 Reddening-corrected flux
in [SIII]9069 line relative to Hbeta
303-312 F10.5 --- [SIII]9532/Hb ?=-999.0 Reddening-corrected flux
in [SIII]9532 line relative to Hbeta
314-323 F10.5 --- [SIII]/Hb ?=-999.0 Reddening-corrected flux in
[SIII]9069+[SIII]9532 relative to Hbeta
325-331 F7.2 --- C(Hb) ?=-999.0 Hbeta reddening constant (2)
333-339 F7.2 mag Av ?=-999.0 Extinction in magnitudes
in V band (2)
341-347 F7.2 mag E(B-V) ?=-999.0 Color excess (2)
349-353 F5.2 kpc R HII region galactocentric radius in kpc
355-358 F4.2 --- R/r25 HII region galactocentric radius
in units of r25
360-363 F4.2 --- R/re HII region galactocentric radius in units
of the disk effective radius (re)
365-388 A24 --- Ref Reference of the work from which HII
region emission-line fluxes and
position were compiled in refs.dat file
390 A1 --- Location1 Location of the region (3)
392 A1 --- Location2 Location of the region (4)
394-400 F7.2 --- OH.HCM ?=-999.0 Oxygen abundance, 12+log(O/H),
from HCM (5)
402-408 F7.2 --- e_OH.HCM ?=-999.0 Uncertainty in OH.HCM
410-417 F8.3 --- OH.N2PP04 ?=-999.0 Oxygen abundance, 12+log(O/H),
from N2_PP04 (5)
419-426 F8.3 --- OH.O3N2PP04 ?=-999.0 Oxygen abundance, 12+log(O/H),
from O3N2_PP04 (5)
428-435 F8.3 --- OH.O3N2M13 ?=-999.0 Oxygen abundance, 12+log(O/H),
from O3N2_M13 (5)
437-444 F8.3 --- OH.N2O2B07 ?=-999.0 Oxygen abundance, 12+log(O/H),
from N2O2_B07 (5)
446-453 F8.3 --- OH.R23MG91 ?=-999.0 Oxygen abundance, 12+log(O/H),
from R23_MG91 (5)
455-462 F8.3 --- OH.R23lowMG91 ?=-999.0 Oxygen abundance, 12+log(O/H),
from R23_MG91, for lower branch (5)
464-471 F8.3 --- OH.R23upMG91 ?=-999.0 Oxygen abundance, 12+log(O/H),
from R23_MG91, for upper branch (5)
473-480 F8.3 --- OH.RPG16 ?=-999.0 Oxygen abundance, 12+log(O/H),
from R_PG16 (5)
482-488 F7.2 --- NO.HCM ?=-999.0 Nitrogen-to-oxygen abundance
ratio, log(N/O), from HCM (6)
490-496 F7.2 --- e_NO.HCM ?=-999.0 Uncertainty in NO.HCM
498-508 F11.6 --- NO.N2O2PC09 ?=-999.0 Nitrogen-to-oxygen abundance
ratio from N2O2_PC09 (6)
510-520 F11.6 --- NO.N2S2PC09 ?=-999.0 Nitrogen-to-oxygen abundance
ratio from N2S2_PC09 (6)
522-530 F9.4 --- NO.RPG16 ?=-999.0 Nitrogen-to-oxygen abundance
ratio from R_PG16 (6)
532-539 F8.3 cm-3 Ne ?=-999.0 Measured electron density
541-548 F8.3 cm-3 Ne.ad ?=-999.0 Adopted electron density
550-556 F7.1 K T(OIII) ?=-999.0 Measured electron temperature
from [OIII] lines: 4363/(4959+5007)
558-563 F6.1 K e_T(OIII) ?=-999.0 Uncertainty in T(OIII)
565-571 F7.1 K T(OII) ?=-999.0 Measured electron temperature
from [OII] lines: 7325/(3727)
573-579 F7.2 K e_T(OII) ?=-999.0 Uncertainty in T(OII)
581-587 F7.1 K T(SII) ?=-999.0 Measured electron temperature
from [SII] lines: 4072/(6717+6731)
589-594 F6.1 K e_T(SII) ?=-999.0 Uncertainty in T(SII)
596-602 F7.1 K T(SIII) ?=-999.0 Measured electron temperature
from [SIII] lines: 6312/(9069+9532)
604-609 F6.1 K e_T(SIII) ?=-999.0 Uncertainty in T(SIII)
611-617 F7.1 K T(NII) ?=-999.0 Measured electron temperature
from [NII] lines: 5755/(6548+6584)
619-624 F6.1 K e_T(NII) ?=-999.0 Uncertainty in T(NII)
626-632 F7.1 K Te.low ?=-999.0 Adopted Te value for the
low excitation region
634-639 F6.1 K e_Te.low ?=-999.0 Uncertainty in Te.low
641 A1 --- f_Te.low [-y] Flag on Te.low (7)
643-649 F7.1 K Te.high ?=-999.0 Adopted Te value for the
high excitation region
651-656 F6.1 K e_Te.high ?=-999.0 Uncertainty in Te.high
658-667 E10.4 --- O+/H+ ?=-999.0 Ionic abundance ratio O+/H+
669-678 E10.4 --- e_O+/H+ ?=-999.0 Uncertainty in O+/H+
680-689 E10.4 --- O++/H+ ?=-999.0 Ionic abundance ratio O++/H+
691-700 E10.4 --- e_O++/H+ ?=-999.0 Uncertainty in O++/H+
702-710 E9.4 --- N+/H+ ?=-999.0 Ionic abundance ratio N+/H+
712-720 E9.4 --- e_N+/H+ ?=-999.0 Uncertainty in N+/H+
722-728 F7.2 --- OH.Te.tw ?=-999.0 Te-based oxygen abundance,
12+log(O/H), derived in this work
730-736 F7.2 --- e_OH.Te.tw ?=-999.0 Uncertainty in OH.Te.tw
738-744 F7.2 --- NO.Te.tw ?=-999.0 Te-based nitrogen-to-oxygen
abundance ratio, log(N/O), derived in
this work
746-752 F7.2 --- e_NO.Te.tw ?=-999.0 Uncertainty in NO.Te.tw
754-760 F7.2 --- OH.Te.pw ?=-999.0 Te-based 12+log(O/H) derived in
previous work (see column 'Ref')
762-768 F7.2 --- e_OH.Te.pw ?=-999.0 Uncertainty in OH.Te.pw
770-776 F7.2 --- NO.Te.pw ?=-999.0 Te-based log(N/O) derived in
previous work (see column 'Ref')
778-784 F7.2 --- e_NO.Te.pw ?=-999.0 Uncertainty in NO.Te.pw
--------------------------------------------------------------------------------
Note (1): The HII region ID was assigned to follow as close as possible
the identification used in the articles from which the line-fluxes
were compiled (see column 'Ref').
Note (2): The HII region internal extinction is given by C(Hb), Av or E(B-V)
depending on the information provided by the different authors
(see column 'Ref').
Note (3): Location of the region as follow:
B = HII region located within the bar region
D = HII region located in the disk of the galaxy
A = HII region excluded from fit to the radial abundance profile
(e.g. close to AGN, signs of shock excitation, or regions with peculiar
metallicities already identified in previous studies).
See the paper (Zurita et al. 2021MNRAS.500.2359Z 2021MNRAS.500.2359Z) for further details.
Note (4): Location of the region as follow:
C = Circumnuclear HII region (these regions are not used in the fits to the
radial abundance profiles)
N = Nuclear HII region
Note (5): Methods for O/H abundance estimates:
HCM = HII-Chi-mistry method (Perez-Montero 2014MNRAS.441.2663P 2014MNRAS.441.2663P)
N2O2_B07 = log([NII]6583/[OII]3727) with the empirical calibration of
Bresolin (2007, IAU Symp. 321, 147)
R23_MG91 = ([OII]3727+[OIII]4959,5007)/Hbeta, as calibrated by
McGaugh (1991ApJ...380..140M 1991ApJ...380..140M) with the
Kobulnicky et al. (1999ApJ...514..544K 1999ApJ...514..544K) parametrization
N2_PP04 = log([NII]6583/Halpha) with the empirical calibration given by
Pettini & Pagel (2004MNRAS.348L..59P 2004MNRAS.348L..59P)
O3N2_PP04 = log(([OIII]5007/Hbeta)/([NII]6583/Halpha)) as calibrated by
Pettini & Pagel (2004MNRAS.348L..59P 2004MNRAS.348L..59P)
O3N2_M13 = log(([OIII]5007/Hbeta)/([NII]6583/Halpha)) as calibrated by
Marino et al. (2013, Cat. J/A+A/559/A114)
R_PG16 = R calibration (Pilyugin & Grebel, 2016MNRAS.457.3678P 2016MNRAS.457.3678P)
d = direct or Te-based method
Note (6): Methods for N/O abundance estimates:
HCM = HII-Chi-mistry method (Perez-Montero, 2014MNRAS.441.2663P 2014MNRAS.441.2663P)
N2O2 = log([NII]6583/[OII]3727) as calibrated by
Perez-Montero & Contini (2009MNRAS.398..949P 2009MNRAS.398..949P)
N2S2 = log([NII]6583/[SII]6717,6731) as calibrated by
Perez-Montero & Contini (2009MNRAS.398..949P 2009MNRAS.398..949P)
R = R calibration (Pilyugin & Grebel, 2016MNRAS.457.3678P 2016MNRAS.457.3678P)
d = direct or Te-based method
Note (7): If 'y', Te.low derived from either T(OII) or the average of T(OII)
and T(SII).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: logno_r.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Galaxy Galaxy name
10- 14 F5.2 kpc r25 Galaxy radius at the 25Bmag/arcsec2 isophote
(from RC3, de Vaucouleurs et al, 1991,
Cat. VII/155)
16- 20 F5.2 kpc re Galaxy disk effective radius
22- 31 F10.5 kpc-1 mHCMs ?=-999.0 log(N/O) abundance gradient from
single linear fit (for HCM) (2)(1)
33- 42 F10.5 kpc-1 e_mHCMs ?=-999.0 Uncertainty in mHCMs
44- 51 F8.3 --- bHCMs ?=-999.0 Central log(N/O) (y-intercept) from
single linear fit (for HCM) (2)
53- 60 F8.3 --- e_bHCMs ?=-999.0 Uncertainty in bHCMs
62- 64 I3 --- nHCMs Number of data points in the fit (HCM)
66- 73 F8.3 --- rHCMs ?=-999.0 Correlation coefficient
(single linear fit, for HCM)
75- 82 F8.3 --- chi2HCMs ?=-999.0 Reduced chi-square parameter
(single linear fit, for HCM)
84- 91 F8.3 --- sigmaHCMs ?=-999.0 Standard deviation of the residuals
(single linear fit, for HCM)
93-102 F10.5 kpc-1 mHCM.in ?=-999.0 Inner log(N/O) gradient from double
linear fit (HCM) (3)
104-113 F10.5 kpc-1 e_mHCM.in ?=-999.0 Uncertainty in mHCM.in
115-122 F8.3 --- bHCM.in ?=-999.0 y-intercept of inner fit to log(N/O)
radial profile (HCM) (3)
124-131 F8.3 --- e_bHCM.in ?=-999.0 Uncertainty in bHCM.in
133-142 F10.5 kpc-1 mHCM.ou ?=-999.0 Outer log(N/O) gradient from
double linear fit (HCM) (3)
144-153 F10.5 kpc-1 e_mHCM.ou ?=-999.0 Uncertainty in mHCM.ou
155-162 F8.3 --- bHCM.ou ?=-999.0 y-intercept of outer fit to log(N/O)
radial profile (HCM) (3)
164-171 F8.3 --- e_bHCM.ou ?=-999.0 Uncertainty in bHCM.ou
173-179 F7.2 kpc rHCMbr ?=-999.0 Break radius in kiloparsecs
(HCM radial profile)
181-187 F7.2 kpc e_rHCMbr ?=-999.0 Uncertainty in rHCMbr
189-196 F8.3 --- chi2HCMb ?=-999.0 Reduced chi-square parameter
(double linear fit, HCM)
198-205 F8.3 --- sigmaHCMb ?=-999.0 Standard deviation of the residuals
(double linear fit, HCM)
207-216 F10.5 kpc-1 mN2O2s ?=-999.0 log(N/O) gradient from single
linear fit (N2O2) (2)(1)
218-227 F10.5 kpc-1 e_mN2O2s ?=-999.0 Uncertainty in mN2O2s
229-236 F8.3 --- bN2O2s ?=-999.0 Central log(N/O) (y-intercept) from
single linear fit (N2O2) (2)
238-245 F8.3 --- e_bN2O2s ?=-999.0 Uncertainty in bN2O2s
247-249 I3 --- nN2O2s Number of data points in the fit (N2O2)
251-258 F8.3 --- rN2O2s ?=-999.0 Correlation coefficient
(single linear fit, for N2O2)
260-267 F8.3 --- chi2N2O2s ?=-999.0 Reduced chi-square parameter
(single linear fit, for N2O2)
269-276 F8.3 --- sigmaN2O2s ?=-999.0 Standard deviation of residuals
(single linear fit, for N2O2)
278-287 F10.5 kpc-1 mN2O2.in ?=-999.0 Inner log(N/O) gradient from
double linear (for N2O2) (3)
289-298 F10.5 kpc-1 e_mN2O2.in ?=-999.0 Uncertainty in mN2O2.in
300-307 F8.3 --- bN2O2.in ?=-999.0 y-intercept of inner fit to log(N/O)
radial profile (N2O2) (3)
309-316 F8.3 --- e_bN2O2.in ?=-999.0 Uncertainty in bN2O2.in
318-327 F10.5 kpc-1 mN2O2.ou ?=-999.0 Outer log(N/O) gradient from
double linear fit (N2O2) (3)
329-338 F10.5 kpc-1 e_mN2O2.ou ?=-999.0 Uncertainty in mN2O2.ou
340-347 F8.3 --- bN2O2.ou ?=-999.0 y-intercept of outer fit to log(N/O)
radial profile (N2O2) (3)
349-356 F8.3 --- e_bN2O2.ou ?=-999.0 Uncertainty in bN2O2.ou
358-364 F7.2 kpc rN2O2br ?=-999.0 Break radius in kiloparsecs
(N2O2 radial profile)
366-372 F7.2 kpc e_rN2O2br ?=-999.0 Uncertainty in rN2O2br
374-381 F8.3 --- chi2N2O2b ?=-999.0 Reduced chi-square parameter
(double linear fit, N2O2)
383-390 F8.3 --- sigmaN2O2b ?=-999.0 Standard deviation of the residuals
(double linear fit, N2O2)
392-401 F10.5 kpc-1 mN2S2s ?=-999.0 log(N/O) gradient from single linear
fit (for N2S2) (2)(1)
403-412 F10.5 kpc-1 e_mN2S2s ?=-999.0 Uncertainty in mN2S2s
414-421 F8.3 --- bN2S2s ?=-999.0 Central log(N/O) (y-intercept) from
single linear fit (for N2S2) (2)
423-430 F8.3 --- e_bN2S2s ?=-999.0 Uncertainty in bN2S2s
432-434 I3 --- nN2S2s Number of data points in the fit (N2S2)
436-443 F8.3 --- rN2S2s ?=-999.0 Correlation coefficient
(single linear fit, for N2S2)
445-452 F8.3 --- chi2N2S2s ?=-999.0 Reduced chi-square parameter
(single linear fit, for N2S2)
454-461 F8.3 --- sigmaN2S2s ?=-999.0 Standard deviation of the residuals
(single linear fit, for N2S2)
463-472 F10.5 kpc-1 mN2S2.in ?=-999.0 Inner log(N/O) gradient from
double linear (N2S2) (3)
474-483 F10.5 kpc-1 e_mN2S2.in ?=-999.0 Uncertainty in mN2S2.in
485-492 F8.3 --- bN2S2.in ?=-999.0 y-intercept of inner fit to log(N/O)
radial profile (N2S2) (3)
494-501 F8.3 --- e_bN2S2.in ?=-999.0 Uncertainty in bN2S2.in
503-512 F10.5 kpc-1 mN2S2.ou ?=-999.0 Outer log(N/O) gradient from
double linear fit (N2S2) (3)
514-523 F10.5 kpc-1 e_mN2S2.ou ?=-999.0 Uncertainty in mN2S2.ou
525-532 F8.3 --- bN2S2.ou ?=-999.0 y-intercept of outer fit to log(N/O)
radial profile (N2S2) (3)
534-541 F8.3 --- e_bN2S2.ou ?=-999.0 Uncertainty in bN2S2.ou
543-549 F7.2 kpc rN2S2br ?=-999.0 Break radius in kiloparsecs
(N2S2 radial profile)
551-557 F7.2 kpc e_rN2S2br ?=-999.0 Uncertainty in rN2S2br
559-566 F8.3 --- chi2N2S2b ?=-999.0 Reduced chi-square parameter
(double linear fit, N2S2)
568-575 F8.3 --- sigmaN2S2b ?=-999.0 Standard deviation of the residuals
(double linear fit, N2S2)
577-586 F10.5 kpc-1 mRs ?=-999.0 log(N/O) gradient from single linear
fit (R calibration) (2)(1)
588-597 F10.5 kpc-1 e_mRs ?=-999.0 Uncertainty in mRs
599-606 F8.3 --- bRs ?=-999.0 Central log(N/O) (y-intercept) from
single linear fit (R calibration) (2)
608-615 F8.3 --- e_bRs ?=-999.0 Uncertainty in bRs
617-619 I3 --- nRs Number of data points in the fit
(R calibration)
621-628 F8.3 --- rRs ?=-999.0 Correlation coefficient
(single linear fit, R calibration)
630-637 F8.3 --- chi2Rs ?=-999.0 Reduced chi-square parameter
(single linear fit, R calibration)
639-646 F8.3 --- sigmaRs ?=-999.0 Standard deviation of the residuals
(single linear fit, R calibration)
648-657 F10.5 kpc-1 mR.in ?=-999.0 Inner log(N/O) gradient from
double linear fit (R calibration) (3)
659-668 F10.5 kpc-1 e_mR.in ?=-999.0 Uncertainty in mR.in
670-677 F8.3 --- bR.in ?=-999.0 y-intercept of inner fit to log(N/O)
radial profile (R calibration) (3)
679-686 F8.3 --- e_bR.in ?=-999.0 Uncertainty in bR.in
688-697 F10.5 kpc-1 mR.ou ?=-999.0 Outer log(N/O) gradient from
double linear fit (R calibration) (3)
699-708 F10.5 kpc-1 e_mR.ou ?=-999.0 Uncertainty in mR.ou
710-717 F8.3 --- bR.ou ?=-999.0 y-intercept of outer fit to log(N/O)
radial profile (R calibration) (3)
719-726 F8.3 --- e_bR.ou ?=-999.0 Uncertainty in bR.ou
728-734 F7.2 kpc rRbr ?=-999.0 Break radius in kiloparsecs
(R calibration radial profile)
736-742 F7.2 kpc e_rRbr ?=-999.0 Uncertainty in rRbr
744-751 F8.3 --- chi2Rb ?=-999.0 Reduced chi-square parameter
(double linear fit, R calibration)
753-760 F8.3 --- sigmaRb ?=-999.0 Standard deviation of the residuals
(double linear fit, R calibration)
762-771 F10.5 kpc-1 mds ?=-999.0 log(N/O) gradient from single linear
fit (direct method) (2)(1)
773-782 F10.5 kpc-1 e_mds ?=-999.0 Uncertainty in mds
784-791 F8.3 --- bds ?=-999.0 Central log(N/O) (y-intercept) from
single linear fit (direct method) (2)
793-800 F8.3 --- e_bds ?=-999.0 Uncertainty in bds
802-804 I3 --- nds Number of data points in the fit
(direct method)
806-813 F8.3 --- rds ?=-999.0 Correlation coefficient
(single linear fit, direct method)
815-822 F8.3 --- chi2ds ?=-999.0 Reduced chi-square parameter
(single linear fit, direct method)
824-831 F8.3 --- sigmads ?=-999.0 Standard deviation of the residuals
(single linear fit, direct method)
833-842 F10.5 kpc-1 md.in ?=-999.0 Inner log(N/O) gradient from double
linear fit (direct method) (3)
844-853 F10.5 kpc-1 e_md.in ?=-999.0 Uncertainty in mTe-based.in
855-862 F8.3 --- bd.in ?=-999.0 y-intercept of inner fit to log(N/O)
radial profile (direct method) (3)
864-871 F8.3 --- e_bd.in ?=-999.0 Uncertainty in bd.in
873-882 F10.5 kpc-1 md.ou ?=-999.0 Outer log(N/O) gradient from
double linear fit (direct method) (3)
884-893 F10.5 kpc-1 e_md.ou ?=-999.0 Uncertainty in md.ou
895-902 F8.3 --- bd.ou ?=-999.0 y-intercept of outer fit to log(N/O)
radial profile (direct method) (3)
904-911 F8.3 --- e_bd.ou ?=-999.0 Uncertainty in bd.ou
913-919 F7.2 kpc rd.br ?=-999.0 Break radius in kiloparsecs
(direct method radial profile)
921-927 F7.2 kpc e_rd.br ?=-999.0 Uncertainty in rd.br
929-936 F8.3 --- chi2db ?=-999.0 Reduced chi-square parameter
(double linear fit, direct method)
938-945 F8.3 --- sigmadb ?=-999.0 Standard deviation of the residuals
(double linear fit, direct method)
947-953 A7 --- discarded Reference for data of a given author excluded
from the fits for this galaxy
--------------------------------------------------------------------------------
Note (1): Methods for N/O abundance estimates:
HCM = HII-Chi-mistry method (Perez-Montero 2014MNRAS.441.2663P 2014MNRAS.441.2663P)
N2O2 = log([NII]6583/[OII]3727) as calibrated by
Perez-Montero & Contini (2009MNRAS.398..949P 2009MNRAS.398..949P)
N2S2 = log([NII]6583/[SII]6717,6731) as calibrated by
Perez-Montero & Contini (2009MNRAS.398..949P 2009MNRAS.398..949P)
R = R calibration (Pilyugin & Grebel, 2016MNRAS.457.3678P 2016MNRAS.457.3678P)
d = direct or Te-based method
Note (2): Coefficients of the least squares linear fit to log(N/O) as a
function of galactocentric radius (R) as parametrized by
log(N/O) = bXs + mXs R, with X = abundance method (see note 1)
In the paper, bXs and mXs are termed b_N/O and alpha_N/O,
respectively.
Note (3): Coefficients of the least squares linear fit to the log(N/O) as a
function of galactocentric radius (R) as parametrized by
log(N/O) = bX.in + mX.in * R for R ≤ rXbr
log(N/O) = bX.ou + mX.ou * R for R > rXbr
with X = abundance method (see note 1)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: logoh_r.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Galaxy Galaxy name
10- 14 F5.2 kpc r25 Galaxy radius at the 25Bmag/arcsec2
isophote (from RC3, de Vaucouleurs et
al., 1991, Cat. VII/155)
16- 20 F5.2 kpc re Galaxy disk effective radius
22- 29 F8.5 kpc-1 mHCMs ?=-999.0 Metallicity gradient from
single linear fit (for HCM) (2)(1)
31- 37 F7.5 kpc-1 e_mHCMs ?=-999.0 Uncertainty in mHCMs
39- 43 F5.3 --- bHCMs ?=-999.0 Central 12+log(O/H)
(y-intercept) from single linear fit
(for HCM) (2)
45- 49 F5.3 --- e_bHCMs ?=-999.0 Uncertainty in bHCMs
51- 53 I3 --- nHCMs Number of data points in the fit (HCM)
55- 60 F6.3 --- rHCMs ?=-999.0 Correlation coefficient
(single linear fit, for HCM)
62- 67 F6.3 --- chi2HCMs ?=-999.0 Reduced chi-square parameter
(single linear fit, for HCM)
69- 73 F5.3 --- sigmaHCMs ?=-999.0 Standard deviation of the
residuals (single linear fit, for HCM)
75- 84 F10.5 kpc-1 mHCM.in ?=-999.0 Inner metallicity gradient from
double linear fit (HCM) (3)
86- 95 F10.5 kpc-1 e_mHCM.in ?=-999.0 Uncertainty in mHCM.in
97- 104 F8.3 --- bHCM.in ?=-999.0 y-intercept of the inner fit to
the 12+log(O/H) radial profile
(HCM) (3)
106- 113 F8.3 --- e_bHCM.in ?=-999.0 Uncertainty in bHCM.in
115- 124 F10.5 kpc-1 mHCM.ou ?=-999.0 Outer metallicity gradient from
double linear fit (HCM) (3)
126- 135 F10.5 kpc-1 e_mHCM.ou ?=-999.0 Uncertainty in mHCM.ou
137- 144 F8.3 --- bHCM.ou ?=-999.0 y-intercept of the outer fit to
the 12+log(O/H) radial profile
(HCM) (3)
146- 153 F8.3 --- e_bHCM.ou ?=-999.0 Uncertainty in bHCM.ou
155- 161 F7.2 kpc rHCMbr ?=-999.0 Break radius in kiloparsecs
(HCM radial profile)
163- 169 F7.2 kpc e_rHCMbr ?=-999.0 Uncertainty in rHCMbr
171- 178 F8.3 --- chi2HCMb ?=-999.0 Reduced chi-square parameter
(double linear fit, HCM)
180- 187 F8.3 --- sigmaHCMb ?=-999.0 Standard deviation of the
residuals (double linear fit, HCM)
189- 198 F10.5 kpc-1 mN2O2s ?=-999.0 Metallicity gradient from
single linear fit (for N2O2) (2)(1)
200- 209 F10.5 kpc-1 e_mN2O2s ?=-999.0 Uncertainty in mN2O2s
211- 218 F8.3 --- bN2O2s ?=-999.0 Central 12+log(O/H)
(y-intercept) from single linear fit
(for N2O2) (2)
220- 227 F8.3 --- e_bN2O2s ?=-999.0 Uncertainty in bN2O2s
229- 231 I3 --- nN2O2s Number of data points in the fit (N2O2)
233- 240 F8.3 --- rN2O2s ?=-999.0 Correlation coefficient
(single linear fit, for N2O2)
242- 249 F8.3 --- chi2N2O2s ?=-999.0 Reduced chi-square parameter
(single linear fit, for N2O2)
251- 258 F8.3 --- sigmaN2O2s ?=-999.0 Standard deviation of the
residuals (single linear fit, for N2O2)
260- 269 F10.5 kpc-1 mN2O2in ?=-999.0 Inner metallicity gradient from
double linear fit (N2O2) (3)
271- 280 F10.5 kpc-1 e_mN2O2in ?=-999.0 Uncertainty in mN2O2.in
282- 289 F8.3 --- bN2O2in ?=-999.0 y-intercept of the inner fit to
the 12+log(O/H) radial profile
(N2O2) (3)
291- 298 F8.3 --- e_bN2O2in ?=-999.0 Uncertainty in bN2O2.in
300- 309 F10.5 kpc-1 mN2O2ou ?=-999.0 Outer metallicity gradient from
double linear fit (N2O2) (3)
311- 320 F10.5 kpc-1 e_mN2O2ou ?=-999.0 Uncertainty in mN2O2.ou
322- 329 F8.3 --- bN2O2ou ?=-999.0 y-intercept of the outer fit to
the 12+log(O/H) radial profile
(N2O2) (3)
331- 338 F8.3 --- e_bN2O2ou ?=-999.0 Uncertainty in bN2O2.ou
340- 346 F7.2 kpc rN2O2br ?=-999.0 Break radius in kiloparsecs
(N2O2 radial profile)
348- 354 F7.2 kpc e_rN2O2br ?=-999.0 Uncertainty in rN2O2br
356- 363 F8.3 --- chi2N2O2b ?=-999.0 Reduced chi-square parameter
(double linear fit, N2O2)
365- 372 F8.3 --- sigmaN2O2b ?=-999.0 Standard deviation of the
residuals (double linear fit, N2O2)
374- 383 F10.5 kpc-1 mR23s ?=-999.0 Metallicity gradient from
single linear fit (for R23) (2)(1)
385- 394 F10.5 kpc-1 e_mR23s ?=-999.0 Uncertainty in mR23s
396- 403 F8.3 --- bR23s ?=-999.0 Central 12+log(O/H)
(y-intercept) from single linear fit
(for R23) (2)
405- 412 F8.3 --- e_bR23s ?=-999.0 Uncertainty in bR23s
414- 416 I3 --- nR23s Number of data points in the fit (R23)
418- 425 F8.3 --- rR23s ?=-999.0 Correlation coefficient
(single linear fit, for R23)
427- 434 F8.3 --- chi2R23s ?=-999.0 Reduced chi-square parameter
(single linear fit, for R23)
436- 443 F8.3 --- sigmaR23s ?=-999.0 Standard deviation of the
residuals (single linear fit, for R23)
445- 454 F10.5 kpc-1 mR23.in ?=-999.0 Inner metallicity gradient from
double linear fit (R23) (3)
456- 465 F10.5 kpc-1 e_mR23.in ?=-999.0 Uncertainty in mR23.in
467- 474 F8.3 --- bR23.in ?=-999.0 y-intercept of the inner fit to
the 12+log(O/H) radial profile
(R23) (3)
476- 483 F8.3 --- e_bR23.in ?=-999.0 Uncertainty in bR23.in
485- 494 F10.5 kpc-1 mR23.ou ?=-999.0 Outer metallicity gradient from
double linear fit (R23) (3)
496- 505 F10.5 kpc-1 e_mR23.ou ?=-999.0 Uncertainty in mR23.ou
507- 514 F8.3 --- bR23.ou ?=-999.0 y-intercept of the outer fit to
the 12+log(O/H) radial profile
(R23) (3)
516- 523 F8.3 --- e_bR23.ou ?=-999.0 Uncertainty in bR23.ou
525- 531 F7.2 kpc rR23br ?=-999.0 Break radius in kiloparsecs
(R23 radial profile)
533- 539 F7.2 kpc e_rR23br ?=-999.0 Uncertainty in rR23br
541- 548 F8.3 --- chi2R23b ?=-999.0 Reduced chi-square parameter
(double linear fit, R23)
550- 557 F8.3 --- sigmaR23b ?=-999.0 Standard deviation of the
residuals (double linear fit, R23)
559- 568 F10.5 kpc-1 mN2s ?=-999.0 Metallicity gradient from
single linear fit (for N2) (2)(1)
570- 579 F10.5 kpc-1 e_mN2s ?=-999.0 Uncertainty in mN2s
581- 588 F8.3 --- bN2s ?=-999.0 Central 12+log(O/H)
(y-intercept) from single linear fit
(for N2) (2)
590- 597 F8.3 --- e_bN2s ?=-999.0 Uncertainty in bN2s
599- 601 I3 --- nN2s Number of data points in the fit (N2)
603- 610 F8.3 --- rN2s ?=-999.0 Correlation coefficient
(single linear fit, for N2)
612- 619 F8.3 --- chi2N2s ?=-999.0 Reduced chi-square parameter
(single linear fit, for N2)
621- 628 F8.3 --- sigmaN2s ?=-999.0 Standard deviation of the
residuals (single linear fit, for N2)
630- 639 F10.5 kpc-1 mN2.in ?=-999.0 Inner metallicity gradient from
double linear fit (N2) (3)
641- 650 F10.5 kpc-1 e_mN2.in ?=-999.0 Uncertainty in mN2.in
652- 659 F8.3 --- bN2.in ?=-999.0 y-intercept of the inner fit to
the 12+log(O/H) radial profile (N2) (3)
661- 668 F8.3 --- e_bN2.in ?=-999.0 Uncertainty in bN2.in
670- 679 F10.5 kpc-1 mN2.ou ?=-999.0 Outer metallicity gradient from
double linear fit (N2) (3)
681- 690 F10.5 kpc-1 e_mN2.ou ?=-999.0 Uncertainty in mN2.ou
692- 699 F8.3 --- bN2.ou ?=-999.0 y-intercept of the outer fit to
the 12+log(O/H) radial profile
(N2) (3)
701- 708 F8.3 --- e_bN2.ou ?=-999.0 Uncertainty in bN2.ou
710- 716 F7.2 kpc rN2br ?=-999.0 Break radius in kiloparsecs
(N2 radial profile)
718- 724 F7.2 kpc e_rN2br ?=-999.0 Uncertainty in rN2br
726- 733 F8.3 --- chi2N2b ?=-999.0 Reduced chi-square parameter
(double linear fit, N2)
735- 742 F8.3 --- sigmaN2b ?=-999.0 Standard deviation of the
residuals (double linear fit, N2)
744- 753 F10.5 kpc-1 mO3N2s ?=-999.0 Metallicity gradient from
single linear fit (for O3N2) (2)(1)
755- 764 F10.5 kpc-1 e_mO3N2s ?=-999.0 Uncertainty in mO3N2s
766- 773 F8.3 --- bO3N2s ?=-999.0 Central 12+log(O/H)
(y-intercept) from single linear fit
(for O3N2) (2)
775- 782 F8.3 --- e_bO3N2s ?=-999.0 Uncertainty in bO3N2s
784- 786 I3 --- nO3N2s Number of data points in the fit (O3N2)
788- 795 F8.3 --- rO3N2s ?=-999.0 Correlation coefficient
(single linear fit, for O3N2)
797- 804 F8.3 --- chi2O3N2s ?=-999.0 Reduced chi-square parameter
(single linear fit, for O3N2)
806- 813 F8.3 --- sigmaO3N2s ?=-999.0 Standard deviation of the
residuals (single linear fit, for O3N2)
815- 824 F10.5 kpc-1 mO3N2.in ?=-999.0 Inner metallicity gradient
from double linear fit (O3N2) (3)
826- 835 F10.5 kpc-1 e_mO3N2.in ?=-999.0 Uncertainty in mO3N2.in
837- 844 F8.3 --- bO3N2.in ?=-999.0 y-intercept of the inner fit to
the 12+log(O/H) radial profile
(O3N2) (3)
846- 853 F8.3 --- e_bO3N2.in ?=-999.0 Uncertainty in bO3N2.in
855- 864 F10.5 kpc-1 mO3N2.ou ?=-999.0 Outer metallicity gradient from
double linear fit (O3N2) (3)
866- 875 F10.5 kpc-1 e_mO3N2.ou ?=-999.0 Uncertainty in mO3N2.ou
877- 884 F8.3 --- bO3N2.ou ?=-999.0 y-intercept of the outer fit to
the 12+log(O/H) radial profile
(O3N2) (3)
886- 893 F8.3 --- e_bO3N2.ou ?=-999.0 Uncertainty in bO3N2.ou
895- 901 F7.2 kpc rO3N2br ?=-999.0 Break radius in kiloparsecs
(O3N2 radial profile)
903- 909 F7.2 kpc e_rO3N2br ?=-999.0 Uncertainty in rO3N2br
911- 918 F8.3 --- chi2O3N2b ?=-999.0 Reduced chi-square parameter
(double linear fit, O3N2)
920- 927 F8.3 --- sigmaO3N2b ?=-999.0 Standard deviation of the
residuals (double linear fit, O3N2)
929- 938 F10.5 kpc-1 mO3N2M13s ?=-999.0 Metallicity gradient from
single linear fit (for O3N2_M13) (2)(1)
940- 949 F10.5 kpc-1 e_mO3N2M13s ?=-999.0 Uncertainty in mO3N2_M13s
951- 958 F8.3 --- bO3N2M13s ?=-999.0 Central 12+log(O/H)
(y-intercept) from single linear fit
(for O3N2_M13) (2)
960- 967 F8.3 --- e_bO3N2M13s ?=-999.0 Uncertainty in bO3N2_M13s
969- 971 I3 --- nO3N2M13s Number of data points in the fit
(O3N2_M13)
973- 980 F8.3 --- rO3N2M13s ?=-999.0 Correlation coefficient
(single linear fit, for O3N2_M13)
982- 989 F8.3 --- chi2O3N2M13s ?=-999.0 O3N2_M13 reduced chi-square
parameter (single linear fit,
for O3N2_M13)
991- 998 F8.3 --- sigmaO3N2M13s ?=-999.0 Standard deviation of the
residuals (single linear fit,
for O3N2_M13)
1000-1009 F10.5 kpc-1 mO3N2_M13.in ?=-999.0 Inner metallicity gradient from
double linear fit (O3N2_M13) (3)
1011-1020 F10.5 kpc-1 emO3N2M13.in ?=-999.0 Uncertainty in mO3N2_M13.in
1022-1029 F8.3 --- bO3N2_M13.in ?=-999.0 y-intercept of the inner fit to
the 12+log(O/H) radial profile
(O3N2_M13) (3)
1031-1038 F8.3 --- ebO3N2M13.in ?=-999.0 Uncertainty in bO3N2_M13.in
1040-1049 F10.5 kpc-1 mO3N2_M13.ou ?=-999.0 Outer metallicity gradient from
double linear fit (O3N2_M13) (3)
1051-1060 F10.5 kpc-1 emO3N2M13.ou ?=-999.0 Uncertainty in mO3N2_M13.ou
1062-1069 F8.3 --- bO3N2_M13.ou ?=-999.0 y-intercept of the outer fit to
the 12+log(O/H) radial profile
(O3N2_M13) (3)
1071-1078 F8.3 --- ebO3N2M13.ou ?=-999.0 Uncertainty in bO3N2_M13.ou
1080-1086 F7.2 kpc rO3N2_M13br ?=-999.0 Break radius in kiloparsecs
(O3N2_M13 radial profile)
1088-1094 F7.2 kpc erO3N2M13br ?=-999.0 Uncertainty in rO3N2_M13br
1096-1103 F8.3 --- chi2O3N2M13b ?=-999.0 O3N2_M13 reduced chi-square
parameter (double linear fit, O3N2_M13)
1105-1112 F8.3 --- sigmaO3N2M13b ?=-999.0 Standard deviation of the
residuals (double linear fit, O3N2_M13)
1114-1123 F10.5 kpc-1 mRs ?=-999.0 Metallicity gradient from
single linear fit (for R calibration)
(2)(1)
1125-1134 F10.5 kpc-1 e_mRs ?=-999.0 Uncertainty in mRs
1136-1143 F8.3 --- bRs ?=-999.0 Central 12+log(O/H)
(y-intercept) from single linear fit
(for R calibration) (2)
1145-1152 F8.3 --- e_bRs ?=-999.0 Uncertainty in bRs
1154-1156 I3 --- nRs Number of data points in the fit (R)
1158-1165 F8.3 --- rRs ?=-999.0 Correlation coefficient
(single linear fit, for R calibration)
1167-1174 F8.3 --- chi2Rs ?=-999.0 Reduced chi-square parameter
(single linear fit, for R calibration)
1176-1183 F8.3 --- sigmaRs ?=-999.0 Standard deviation of the
residuals (single linear fit,
for R calibration)
1185-1194 F10.5 kpc-1 mR.in ?=-999.0 Inner metallicity gradient from
double linear fit (R calibration) (3)
1196-1205 F10.5 kpc-1 e_mR.in ?=-999.0 Uncertainty in mR.in
1207-1214 F8.3 --- bR.in ?=-999.0 y-intercept of the inner fit to
the 12+log(O/H) radial profile
(R calibration) (3)
1216-1223 F8.3 --- e_bR.in ?=-999.0 Uncertainty in bR.in
1225-1234 F10.5 kpc-1 mR.ou ?=-999.0 Outer metallicity gradient from
double linear fit (R calibration) (3)
1236-1245 F10.5 kpc-1 e_mR.ou ?=-999.0 Uncertainty in mR.ou
1247-1254 F8.3 --- bR.ou ?=-999.0 y-intercept of the outer fit to
the 12+log(O/H) radial profile
(R calibration) (3)
1256-1263 F8.3 --- e_bR.ou ?=-999.0 Uncertainty in bR.ou
1265-1271 F7.2 kpc rRbr ?=-999.0 Break radius in kiloparsecs
(R calibration radial profile)
1273-1279 F7.2 kpc e_rRbr ?=-999.0 Uncertainty in rRbr
1281-1288 F8.3 --- chi2Rb ?=-999.0 Reduced chi-square parameter
(double linear fit, R calibration)
1290-1297 F8.3 --- sigmaRb ?=-999.0 Standard deviation of the
residuals (double linear fit,
R calibration)
1299-1308 F10.5 kpc-1 mds ?=-999.0 Metallicity gradient from
single linear fit (for direct method)
(2)(1)
1310-1319 F10.5 kpc-1 e_mds ?=-999.0 Uncertainty in mds
1321-1328 F8.3 --- bds ?=-999.0 Central 12+log(O/H)
(y-intercept) from single linear fit
(for direct method) (2)
1330-1337 F8.3 --- e_bds ?=-999.0 Uncertainty in bds
1339-1341 I3 --- nds Number of data points in the fit
(direct method)
1343-1350 F8.3 --- rds ?=-999.0 Correlation coefficient
(single linear fit, for direct method)
1352-1359 F8.3 --- chi2ds ?=-999.0 Reduced chi-square parameter
(single linear fit, for direct method)
1361-1368 F8.3 --- sigmads ?=-999.0 Standard deviation of the
residuals (single linear fit,
for direct method)
1370-1375 F6.1 kpc-1 md.in ?=-999.0 Inner metallicity gradient from
double linear fit (direct method) (3)
1377-1382 F6.1 kpc-1 e_md.in ?=-999.0 Uncertainty in md.in
1384-1389 F6.1 --- bd.in ?=-999.0 y-intercept of the inner fit to
the 12+log(O/H) radial profile
(direct method) (3)
1391-1396 F6.1 --- e_bd.in ?=-999.0 Uncertainty in bd.in
1398-1403 F6.1 kpc-1 md.ou ?=-999.0 Outer metallicity gradient from
double linear fit (direct method) (3)
1405-1410 F6.1 kpc-1 e_md.ou ?=-999.0 Uncertainty in md.ou
1412-1417 F6.1 --- bd.ou ?=-999.0 y-intercept of the outer fit to
the 12+log(O/H) radial profile
(direct method) (3)
1419-1424 F6.1 --- e_bd.ou ?=-999.0 Uncertainty in bd.ou
1426-1431 F6.1 kpc rd.br ?=-999.0 Break radius in kiloparsecs
(direct method radial profile)
1433-1438 F6.1 kpc e_rd.br ?=-999.0 Uncertainty in rd.br
1440-1445 F6.1 --- chi2db ?=-999.0 Reduced chi-square parameter
(double linear fit, direct method)
1447-1452 F6.1 --- sigmadb ?=-999.0 Standard deviation of the
residuals (double linear fit,
direct method)
1454-1460 A7 --- discarded Reference for data of a given author
excluded from the fits for this galaxy
--------------------------------------------------------------------------------
Note (1): Methods for O/H abundance estimates:
HCM = HII-Chi-mistry method (Perez-Montero, 2014MNRAS.441.2663P 2014MNRAS.441.2663P)
N2O2 = log([NII]6583/[OII]3727) with the empirical calibration of
Bresolin (2007, IAU Symp. 321, 147)
R23 = ([OII]3727+[OIII]4959,5007)/Hbeta, as calibrated by
McGaugh (1991ApJ...380..140M 1991ApJ...380..140M) with the
Kobulnicky et al. (1999ApJ...514..544K 1999ApJ...514..544K) parametrization
N2 = log([NII]6583/Halpha) with the empirical calibration given by
Pettini & Pagel (2004MNRAS.348L..59P 2004MNRAS.348L..59P)
O3N2 = log(([OIII]5007/Hbeta)/([NII]6583/Halpha)) as calibrated by
Pettini & Pagel (22004MNRAS.348L..59P004)
O3N2_M13 = log(([OIII]5007/Hbeta)/([NII]6583/Halpha)) as calibrated by
Marino et al. (2013, Cat. J/A+A/559/A114)
R = R calibration (Pilyugin & Grebel, 2016MNRAS.457.3678P 2016MNRAS.457.3678P)
d = direct or Te-based method
Note (2): Coefficients of the least squares linear fit to 12+log(O/H) as a
function of galactocentric radius (R) as parametrized by
12 + log (O/H) = bXs + mXs R, with X = abundance method (see note 1)
In the paper, bXs and mXs are termed b_O/H and alpha_O/H, respectively.
Note (3): Coefficients of the least squares linear fit to the 12 + log(O/H) as a
function of galactocentric radius (R) as parametrized by
12 + log (O/H) = bX.in + mX.in * R for R ≤ rXbr
12 + log (O/H) = bX.ou + mX.ou * R for R > rXbr
with X = abundance method (see note 1)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 24 A24 --- Ref Reference code
26- 44 A19 --- BibCode BibCode
46- 73 A28 --- Aut Author's name
--------------------------------------------------------------------------------
Acknowledgements:
Almudena Zurita, azurita(at)ugr.es
References:
Zurita et al., Paper II 2021MNRAS.500.2380Z 2021MNRAS.500.2380Z
(End) Patricia Vannier [CDS] 10-Dec-2020