J/MNRAS/508/1084 MaNGA star-forming galaxies (Kumari+, 2021)
Hardness of ionizing radiation fields in MaNGA star-forming galaxies.
Kumari N., Amorin R., Perez-Montero E., Vilchez J., Maiolino R.
<Mon. Not. R. Astron. Soc. 508, 1084-1101 (2021)>
=2021MNRAS.508.1084K 2021MNRAS.508.1084K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Galaxies, optical ; H II regions
Keywords: galaxies: active - galaxies: ISM
Abstract:
We investigate radiation hardness within a representative sample of 67
nearby (0.02≲z≲0.06) star-forming (SF) galaxies using the integral
field spectroscopic data from the MaNGA survey. The softness parameter
η=(O+/O2+)/(S+/S2+) is sensitive to the spectral energy
distribution of the ionizing radiation. We study η via the
observable quantity η'(=([OII]/[OIII])/([SII][SIII])). We analyze
the relation between radiation hardness (traced by η and η')
and diagnostics sensitive to gas-phase metallicity, electron
temperature, density, ionization parameter, effective temperature,
and age of ionizing populations. It is evident that low metallicity is
accompanied by low logη', i.e. hard radiation field. No direct
relation is found between radiation hardness and other nebular
parameters though such relations cannot be ruled out. We provide
empirical relations between logη and strong emission line ratios
N2, O3N2, and Ar3O3, which will allow future studies of radiation
hardness in SF galaxies where weak auroral lines are undetected. We
compare the variation of [OIII]/[OII] and [SIII]/[SII] for MaNGA data
with SF galaxies and HII regions within spiral galaxies from
literature and find that the similarity and differences between
different data set are mainly due to the metallicity. We find that
predictions from photoionization models considering young and evolved
stellar populations as ionizing sources in good agreement with the
MaNGA data. This comparison also suggests that hard radiation fields
from hot and old low-mass stars within or around SF regions might
significantly contribute to the observed η values.
Description:
For this work, we use data products included in the MaNGA DR14 Pipe3D
value added catalogue (VAC) (Sanchez et al., 2016RMxAA..52...21S 2016RMxAA..52...21S;
2016RMxAA..52..171S 2016RMxAA..52..171S; 2016A&A...594A..36S 2016A&A...594A..36S, Cat. J/A+A/594/A36).
We used the IFS MaNGA data of 67 nearby (0.02≲z≲0.06) SF galaxies
to explore the relation between radiation hardness and various
properties encoded in the emission lines emanating from the ionized
gas within SF galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 67 General properties of sample MaNGA galaxies
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See also:
J/A+A/594/A36 : CALIFA Survey DR3 list of galaxies (Sanchez+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Plate-IFU Plate identifications mentioned in
DR14 catalogue
12- 21 F10.6 deg RAdeg Right Ascension (J2000)
24- 34 F11.8 deg DEdeg Declination (J2000)
36- 41 F6.4 --- z Redshift
43- 47 F5.2 [Msun] log(M*) logarithm of stellar mass
49- 54 F6.3 [Msun/yr] log(SFR) logarithm of star formation rate
56- 59 F4.2 kpc/arcsec Scale Spatial Scale
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Acknowledgements:
Nimisha Kumari, kumari(at)stsci.edu
References:
Goddard et al., 2017MNRAS.466.4731G 2017MNRAS.466.4731G
Parikh et al., 2018MNRAS.477.3954P 2018MNRAS.477.3954P
Sanchez et al., 2016RMxAA..52...21S 2016RMxAA..52...21S
Sanchez et al., 2016RMxAA..52..171S 2016RMxAA..52..171S
Sanchez et al., 2016A&A...594A..36S 2016A&A...594A..36S, Cat. J/A+A/594/A36
(End) Patricia Vannier [CDS] 14-Oct-2021