J/A+A/664/A92 GAMA. MegaMorp/GalfitM profile fits (Haeussler+, 2022)
Galapagos-2/Galfitm - multi-wavelength measurement of galaxy structure:
separating the properties of spheroid and disk components in modern surveys.
Haeussler B., Vika M., Bamford S.P., Johnston E.J., Brough S., Casura S.,
Holwerda B.W., Kelvin L.S., Popescu C.
<Astron. Astrophys. 664, A92 (2022)>
=2022A&A...664A..92H 2022A&A...664A..92H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Galaxies, optical ; Galaxies, IR ;
Galaxies, photometry ; Morphology
Keywords: methods: data analysis - techniques: image processing -
galaxies: structure - galaxies: bulges - surveys -
galaxies: fundamental parameters
Abstract:
We present the capabilities of Galapagos-2 and Galfitm in the context
of fitting two-component profiles - bulge-disk decompositions - to
galaxies, with the ultimate goal of providing complete multi-band,
multi-component fitting of large samples of galaxies in future
surveys. We also release both the code and the fit results to 234 239
objects from the DR3 of the GAMA survey, a sample significantly deeper
than in previous works.
We use stringent tests on both simulated and real data, as well as
comparison to public catalogues to evaluate the advantages of using
multi-band over single-band data.
We show that multi-band fitting using Galfitm provides significant
advantages when trying to decompose galaxies into their individual
constituents, as more data are being used, by effectively being able
to use the colour information buried in the individual exposures to
its advantage. Using simulated data, we find that multi-band fitting
significantly reduces deviations from the real parameter values,
allows component sizes and Sersic indices to be recovered more
accurately, and - by design - constrains the band-to-band variations
of these parameters to more physical values. On both simulated and
real data, we confirm that the spectral energy distributions (SEDs) of
the two main components can be recovered to fainter magnitudes
compared to using single-band fitting, which tends to recover
'disks' and 'bulges' with - on average - identical SEDs when
the galaxies become too faint, instead of the different SEDs they
truly have. By comparing our results to those provided by other
fitting codes, we confirm that they agree in general, but measurement
errors can be significantly reduced by using the multi-band tools
developed by the MEGAMORPH project.
We conclude that the multi-band fitting employed by Galapagos-2 and
Galfitm significantly improves the accuracy of structural galaxy
parameters and enables much larger samples to be be used in a
scientific analysis.
Description:
This catalogue provides the results of fitting both a single Sersic
component model as well as a two-component bulge-disk model to the 2D
surface brightness distributions of galaxies in the GAMA II
G09/G12/G15 survey (Driver et al., 2011MNRAS.413..971D 2011MNRAS.413..971D,
J/MNRAS/413/971) regions using the
http://www.nottingham.ac.uk/astronomy/megamorph MegaMorph multi-band
fitting method, Galapagos-2 (Haeussler et al., 2013MNRAS.430..330H 2013MNRAS.430..330H,
Barden et al., 2012MNRAS.422..449B 2012MNRAS.422..449B) and GalfitM (Haeussler et al.,
2013MNRAS.430..330H 2013MNRAS.430..330H). In this method the ugri (from KiDS, de Jong et
al., 2013ExA....35...25D 2013ExA....35...25D) and zYJHK (from VIKING, Edge et al.,
2013Msngr.154...32E 2013Msngr.154...32E, Cat. II/329) surface brightness distributions of
a galaxy are fit simultaneously while imposing some constraints on how
some of the model parameters are allowed to vary with wavelength.
Summary of fitting procedure are given in Haeussler et al.,
2013MNRAS.430..330H 2013MNRAS.430..330H,
https://ui.adsabs.harvard.edu/abs/2013MNRAS.430..330H, and Haeussler
et al. (2022A&A...664A..92H 2022A&A...664A..92H, this paper).
Some important information in order to use the catalogue are
summarized here:
- PSFs have been created using PSFEx (astromatic, Bertin, 2011, ASP
Conf. Ser., 442) using a dense grid. The closest PSF to an object has
been chosen for the fit
- Source detection has been carried out using SExtractor (Bertin &
Arnouts, 1996A&AS..117..393B 1996A&AS..117..393B), on the r-band image. SOurce
identification has been carried out via a unique/best identification
within 2 arcseconds.
- Component centres, axial ratios and position angles are constrained
to be the same at all wavelengths
- We provide both a single Sersic model and two 2-component (Sersic +
exponential (GA_MMBD1) and deVauc + exponential (GA_MMBD4)) models to
our sample. Sersic index and effective radius for the single Sersic
fit are allowed to vary (up to) as a quadratic function of wavelength,
whilst Sersic index and effective radius for each component of the
2-component fit are constant with wavelength (≡4 in case of
de Vaucouleurs profiles f the bulges).
- In all cases an 8th-order polynomial is used for magnitude, which is
therefore effectively free to vary between bands. The MAG*CHEB values
are hence to be used with a big grain of salt to interpolate values.
- Effective filter wavelengths are used as follows for the polynomial fits
u-band: 3543Å
g-band: 4770Å
r-band: 6231Å
i-band: 7625Å
z-band: 9134Å
Y-band: 10305Å
J-band: 12483Å
H-band: 16313Å
K/Ks-band: 22010Å
Chebyshev values for magnitudes (warning!)
Chebyshev values for magnitudes in all fits apply full freedom, (e.g.
polynomial of 8th order for 9 bands). As such, the polynomial between
the mentioned wavelengths are unconstrained and not ideal for
interpolating magnitudes. In practice, they are often smooth, but care
should be taken when trying to interpolate the wavelengths to, e.g.,
restframe wavelengths. Chebyshev polynomials for halflight radius and
sersic index are of lower value and can be interpreted without issue
We advice users to carefully select their samples.
Advice is given in Haeussler et al. (2013MNRAS.430..330H 2013MNRAS.430..330H and 2022) on
what constraints to use for such a selection. E.g. objects along the
edge of the allowed parameter space should be considers and non-free
fits, and their values should be avoided. As such a selection will
depend on the science case (clean vs large sample), we make no attempt
to solve this issue universally for all science cases. In Haeussler
2013 and 2022, we use the following constraints, and we advice user to
avoid values CLOSE to those (e.g. 0.205<n_galfit<7.95, for a
0.2<n<8 constraint) for single-sersic fits (checked for EACH BAND):
- 0.2 < n < 8
- 0.3 < re < 400
- 0.001 < q < 1.0
- 0 < mag < 40
- mag_best-5+offset < mag < mag_best+5+offset (within 5 mags of starting
value of the fit) with offset (ugrizYJHK) being
[1.6562516, 0.93480262, -0.035029945, -0.55207007, -0.77597345,
-0.84817872, -0.95977787, -1.1561573, -1.1386097]
- flag_galfit ≡ 2 (fit needs to have finished)
for B/D fits (checked for EACH BAND):
- 0.2 < n_bulge < 8
- X and Y position within 0.5*regalfitr of single-sersic position
- 0.3 < re_bulge < 400
- 0.3 < re_disk < 400
- 0.001 < q_bulge < 1.0
- 0.001 < q_disk < 1.0
- 0 < mag_bulge < 40
- 0 < mag_disk < 40
- maggalfitband[i]+2.5alog10(2)-5 < mag_bulge[i]
< maggalfitband[i]+2.5alog10(2)+5
(within 5 magnitudes of starting value of the fit, e.g. half the flux of
the single-sersic fit)
- maggalfitband[i]+2.5alog10(2)-5 < mag_disk[i]
< maggalfitband[i]+2.5alog10(2)+5
(within 5 magnitudes of starting value of the fit, e.g. half the flux of
the single-sersic fit)
- flaggalfitbd ≡ 2 (fit needs to have finished)
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
ga-mmbd1.dat 2960 234239 B/D fits with free bulge sersic index
ga_mmbd1.fit 2880 87613 fits version of ga-mmbd1.dat
ga-mmbd4.dat 2960 234239 B/D fits with fixed bulge sersic index (≡4)
ga_mmbd4.fit 2880 87613 fits version of ga-mmbd4.dat
--------------------------------------------------------------------------------
See also:
II/329 : VIKING catalogue data release 1 (Edge+, 2013)
II/344 : KiDS-ESO-DR2 multi-band source catalog (de Jong+, 2015)
II/347 : KiDS-ESO-DR3 multi-band source catalog (de Jong+, 2017)
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
Byte-by-byte Description of file: ga-mmbd1.dat ga-mmbd4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 I7 --- GAMA GAMA object ID (CATAID)
9- 23 A15 --- GALA GALAPAGOS object identifier (GALA_ID)
25- 33 F9.5 deg RAdeg Right ascension (J2000) of the
GAMA object (RA)
35- 42 F8.5 deg DEdeg Declination (J2000) of the
GAMA object (DEC)
44- 54 F11.7 deg RAGdeg SExtractor: Right ascension (J2000) of
the object (RA_GALA)
56- 65 F10.7 deg DEGdeg SExtractor: Declination (J2000) of
the object (DEC_GALA)
67- 72 F6.2 deg thetaimg SExtractor: Position angle on the image,
counterclockwise, 0 is the NAXIS1 image
axis (THETA_IMAGE)
74- 78 F5.3 --- Ell SExtractor: Axial ratio of galaxy, b/a
(ELLIPTICITY)
80- 99 F20.17 arcsec Rflux SExtractor: Halflight radius
(FLUX_RADIUS)
101- 118 F18.16 arcsec RKron SExtractor: Kron radius (KRON_RADIUS)
120- 127 F8.4 ct bckg SExtractor: Local background (BACKGROUND)
129- 140 E12.4 ct FluxBest SExtractor: Flux estimate (FLUX_BEST)
142- 163 F22.4 ct e_FluxBest SExtractor: Flux error (FLUXERR_BEST)
165- 171 F7.4 mag magBest SExtractor: Magnitude estimate (MAG_BEST)
173- 184 E12.6 mag e_magBest SExtractor: Magnitude estimate error
(MAGERR_BEST)
186- 192 F7.4 pix FWHMimg SExtractor: Image FWHM (FWHM_IMAGE)
194- 195 I2 --- Flags SExtractor flags (FLAGS)
197- 201 F5.3 --- ClassStar SExtractor: Star/galaxy classifier
(CLASS_STAR)
203- 204 I2 --- Flag [-1/2] Galapagos: Status of fit
(FLAG_GALFIT) (1)
206- 208 I3 --- Nneigh ?=-99 Galapagos: Number of neighbouring
objects fit in parallel (in SS fit,
held fixed in B/D fit) (NEIGH_GALFIT)
210- 221 E12.6 --- chi2 ?=-99 Galfit: Chi^2 value of the fit
(CHISQ_GALFIT)
223- 234 E12.6 --- chi2P ?=-99 Galfit: Chi^2 value of the fit
(within the SExtractor ellipse of the
primary) (CHISQGALFITPRIME)
236- 244 I9 --- NDOF ?=-99 Galfit: Degree of freedom
(NDOF_GALFIT) (2)
246- 251 I6 --- NDOFP Galfit: Degree of freedom, within the
SExtractor ellipse of the primary
(NDOFGALFITPRIME) (2)
253- 264 E12.6 --- chi2nu ?=-99 Galfit: reduced Chi^2 ≡ CHISQ/NDOF
(CHI2NU_GALFIT)
266- 277 E12.6 --- chi2nuP ?=-99 Galfit: reduced Chi^2 ≡ CHISQ/NDOF
(within the SExtractor ellipse of the
primary) (CHI2NUGALFITPRIME)
279- 287 F9.6 ct SkyGALAu Galapagos: Sky level (determined by
GALAPAGOS and held fixed)
(SKYGALABAND_U)
289- 297 F9.6 ct SkyGALAg Galapagos: Sky level (determined by
GALAPAGOS and held fixed)
(SKYGALABAND_G)
299- 308 F10.6 ct SkyGALAr Galapagos: Sky level (determined by
GALAPAGOS and held fixed)
(SKYGALABAND_R)
310- 319 F10.6 ct SkyGALAi Galapagos: Sky level (determined by
GALAPAGOS and held fixed)
(SKYGALABAND_I)
321- 330 F10.6 ct SkyGALAz Galapagos: Sky level (determined by
GALAPAGOS and held fixed)
(SKYGALABAND_Z)
332- 341 F10.6 ct SkyGALAY Galapagos: Sky level (determined by
GALAPAGOS and held fixed)
(SKYGALABAND_Y)
343- 352 F10.6 ct SkyGALAJ Galapagos: Sky level (determined by
GALAPAGOS and held fixed)
(SKYGALABAND_J)
354- 364 F11.6 ct SkyGALAH Galapagos: Sky level (determined by
GALAPAGOS and held fixed)
(SKYGALABAND_H)
366- 375 F10.6 ct SkyGALAK Galapagos: Sky level (determined by
GALAPAGOS and held fixed)
(SKYGALABAND_K)
377- 385 F9.6 ct e_SkyGALAu Galapagos: Error on Sky level (determined
by GALAPAGOS and held fixed)
(SKYSIGBAND_U)
387- 395 F9.6 ct e_SkyGALAg Galapagos: Error on Sky level (determined
by GALAPAGOS and held fixed)
(SKYSIGBAND_G)
397- 404 F8.6 ct e_SkyGALAr Galapagos: Error on Sky level (determined
by GALAPAGOS and held fixed)
(SKYSIGBAND_R)
406- 415 F10.6 ct e_SkyGALAi Galapagos: Error on Sky level (determined
by GALAPAGOS and held fixed)
(SKYSIGBAND_I)
417- 425 F9.6 ct e_SkyGALAz Galapagos: Error on Sky level (determined
by GALAPAGOS and held fixed)
(SKYSIGBAND_Z)
427- 436 F10.6 ct e_SkyGALAY Galapagos: Error on Sky level (determined
by GALAPAGOS and held fixed)
(SKYSIGBAND_Y)
438- 447 F10.6 ct e_SkyGALAJ Galapagos: Error on Sky level (determined
by GALAPAGOS and held fixed)
(SKYSIGBAND_J)
449- 459 F11.6 ct e_SkyGALAH Galapagos: Error on Sky level (determined
by GALAPAGOS and held fixed)
(SKYSIGBAND_H)
461- 470 F10.6 ct e_SkyGALAK Galapagos: Error on Sky level (determined
by GALAPAGOS and held fixed)
(SKYSIGBAND_K)
472- 475 F4.1 --- SkyFlagu Galapagos: flag to indicate the goodness
of the background estimation.
SExtractor-style additive values,
see NOTES for details) (SKYFLAGBAND_U)
477- 480 F4.1 --- SkyFlagg [0/12] Galapagos: flag to indicate the
goodness of the background estimation.
(SKYFLAGBAND_G)
482- 485 F4.1 --- SkyFlagr [0/64] Galapagos: flag to indicate the
goodness of the background estimation.
(SKYFLAGBAND_R)
487- 490 F4.1 --- SkyFlagi [0/12] Galapagos: flag to indicate the
goodness of the background estimation.
(SKYFLAGBAND_I)
492- 495 F4.1 --- SkyFlagz [0/12] Galapagos: flag to indicate the
goodness of the background estimation.
(SKYFLAGBAND_Z)
497- 500 F4.1 --- SkyFlagY [0/12] Galapagos: flag to indicate the
goodness of the background estimation.
(SKYFLAGBAND_Y)
502- 505 F4.1 --- SkyFlagJ [0/12] Galapagos: flag to indicate the
goodness of the background estimation.
(SKYFLAGBAND_J)
507- 510 F4.1 --- SkyFlagH [0/12] Galapagos: flag to indicate the
goodness of the background estimation.
(SKYFLAGBAND_H)
512- 515 F4.1 --- SkyFlagK [0/12] Galapagos: flag to indicate the
goodness of the background estimation.
(SKYFLAGBAND_K)
517- 519 I3 --- XDOF [0/1]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for
X-position (0=fixed, 1=constant with
wavelength, etc) (XGALFITDEG)
521- 530 F10.6 pix Xpos Galfit: X-position within postage stamp
(X_GALFIT)
532- 543 E12.6 pix e_Xpos ?=-99999 Galfit: Error on X-position
(XERR_GALFIT)
545- 547 I3 --- YDOF [0/1]?=-99 Degree of Freedom in the
Chebyshev polynomial used for Y-position
(0=fixed, 1=constant with wavelength,
etc) (YGALFITDEG)
549- 558 F10.6 pix Ypos Galfit: Y-position within postage stamp
(Y_GALFIT)
560- 571 E12.6 pix e_Ypos ?=-99999 Galfit: Error on X-position
(YERR_GALFIT)
573- 575 I3 --- magDOF [0/9]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for
single-sersic Magnitude (0=fixed,
1=constant with wavelength, etc)
(MAGGALFITDEG)
577- 587 F11.6 mag umag ?=-999 Galfit: Apparent magnitude
(MAGGALFITBAND_U)
589- 599 F11.6 mag gmag ?=-999 Galfit: Apparent magnitude
(MAGGALFITBAND_G)
601- 611 F11.6 mag rmag ?=-999 Galfit: Apparent magnitude
(MAGGALFITBAND_R)
613- 623 F11.6 mag imag ?=-999 Galfit: Apparent magnitude
(MAGGALFITBAND_I)
625- 635 F11.6 mag zmag ?=-999 Galfit: Apparent magnitude
(MAGGALFITBAND_Z)
637- 647 F11.6 mag Ymag ?=-999 Galfit: Apparent magnitude
(MAGGALFITBAND_Y)
649- 659 F11.6 mag Jmag ?=-999 Galfit: Apparent magnitude
(MAGGALFITBAND_J)
661- 671 F11.6 mag Hmag ?=-999 Galfit: Apparent magnitude
(MAGGALFITBAND_H)
673- 683 F11.6 mag Kmag ?=-999 Galfit: Apparent magnitude
(MAGGALFITBAND_K)
685- 696 E12.6 mag e_umag ?=-99999 Galfit: Error on apparent
magnitude (MAGERRGALFITBAND_U)
698- 709 E12.6 mag e_gmag ?=-99999 Galfit: Error on apparent
magnitude (MAGERRGALFITBAND_G)
711- 722 E12.6 mag e_rmag ?=-99999 Galfit: Error on apparent
magnitude (MAGERRGALFITBAND_R)
724- 735 E12.6 mag e_imag ?=-99999 Galfit: Error on apparent
magnitude (MAGERRGALFITBAND_I)
737- 748 E12.6 mag e_zmag ?=-99999 Galfit: Error on apparent
magnitude (MAGERRGALFITBAND_Z)
750- 761 E12.6 mag e_Ymag ?=-99999 Galfit: Error on apparent
magnitude (MAGERRGALFITBAND_Y)
763- 774 E12.6 mag e_Jmag ?=-99999 Galfit: Error on apparent
magnitude (MAGERRGALFITBAND_J)
776- 787 E12.6 mag e_Hmag ?=-99999 Galfit: Error on apparent
magnitude (MAGERRGALFITBAND_H)
789- 800 E12.6 mag e_Kmag ?=-99999 Galfit: Error on apparent
magnitude (MAGERRGALFITBAND_K)
802- 812 F11.6 --- magCheb0 ?=-999 Galfit: Apparent magnitude
Chebyshev parameter 0th order
(MAGGALFITCHEB_0) (3)
814- 824 F11.6 --- magCheb1 ?=-999 Galfit: Apparent magnitude
Chebyshev parameter 1st order
(MAGGALFITCHEB_1) (3)
826- 836 F11.6 --- magCheb2 ?=-999 Galfit: Apparent magnitude
Chebyshev parameter 2nd order
(MAGGALFITCHEB_2) (3)
838- 848 F11.6 --- magCheb3 ?=-999 Galfit: Apparent magnitude
Chebyshev parameter 3rd order
(MAGGALFITCHEB_3) (3)
850- 860 F11.6 --- magCheb4 ?=-999 Galfit: Apparent magnitude
Chebyshev parameter 4th order
(MAGGALFITCHEB_4) (3)
862- 872 F11.6 --- magCheb5 ?=-999 Galfit: Apparent magnitude
Chebyshev parameter 5th order
(MAGGALFITCHEB_5) (3)
874- 884 F11.6 --- magCheb6 ?=-999 Galfit: Apparent magnitude
Chebyshev parameter 6th order
(MAGGALFITCHEB_6) (3)
886- 896 F11.6 --- magCheb7 ?=-999 Galfit: Apparent magnitude
Chebyshev parameter 7th order
(MAGGALFITCHEB_7) (3)
898- 908 F11.6 --- magCheb8 ?=-999 Galfit: Apparent magnitude
Chebyshev parameter 8th order
(MAGGALFITCHEB_8) (3)
910- 921 E12.6 --- e_magCheb0 ?=-99999 Galfit: Error on Apparent
magnitude Chebyshev parameter 0th order
(MAGERRGALFITCHEB_0)
923- 934 E12.6 --- e_magCheb1 ?=-99999 Galfit: Error on Apparent
magnitude Chebyshev parameter 1st order
(MAGERRGALFITCHEB_1)
936- 947 E12.6 --- e_magCheb2 ?=-99999 Galfit: Error on Apparent
magnitude Chebyshev parameter 2nd order
(MAGERRGALFITCHEB_2)
949- 960 E12.6 --- e_magCheb3 ?=-99999 Galfit: Error on Apparent
magnitude Chebyshev parameter 3rd order
(MAGERRGALFITCHEB_3)
962- 973 E12.6 --- e_magCheb4 ?=-99999 Galfit: Error on Apparent
magnitude Chebyshev parameter 4th order
(MAGERRGALFITCHEB_4)
975- 986 E12.6 --- e_magCheb5 ?=-99999 Galfit: Error on Apparent
magnitude Chebyshev parameter 5th order
(MAGERRGALFITCHEB_5)
988- 999 E12.6 --- e_magCheb6 ?=-99999 Galfit: Error on Apparent
magnitude Chebyshev parameter 6th order
(MAGERRGALFITCHEB_6)
1001-1012 E12.6 --- e_magCheb7 ?=-99999 Galfit: Error on Apparent
magnitude Chebyshev parameter 7th order
(MAGERRGALFITCHEB_7)
1014-1025 E12.6 --- e_magCheb8 ?=-99999 Galfit: Error on Apparent
magnitude Chebyshev parameter 8th order
(MAGERRGALFITCHEB_8)
1027-1029 I3 --- ReDOF [0/3]?=-99 Degree of Freedom in the
Chebyshev polynomial used for
single-sersic size (0=fixed, 1=constant
with wavelength, etc) (REGALFITDEG)
1031-1041 F11.6 arcsec Reu ?=-99 Galfit: Effective radius
(REGALFITBAND_U)
1043-1053 F11.6 arcsec Reg ?=-99 Galfit: Effective radius
(REGALFITBAND_G)
1055-1065 F11.6 arcsec Rer ?=-99 Galfit: Effective radius
(REGALFITBAND_R)
1067-1077 F11.6 arcsec Rei ?=-99 Galfit: Effective radius
(REGALFITBAND_I)
1079-1089 F11.6 arcsec Rez ?=-99 Galfit: Effective radius
(REGALFITBAND_Z)
1091-1101 F11.6 arcsec ReY ?=-99 Galfit: Effective radius
(REGALFITBAND_Y)
1103-1113 F11.6 arcsec ReJ ?=-99 Galfit: Effective radius
(REGALFITBAND_J)
1115-1125 F11.6 arcsec ReH ?=-99 Galfit: Effective radius
(REGALFITBAND_H)
1127-1137 F11.6 arcsec ReK ?=-99 Galfit: Effective radius
(REGALFITBAND_K)
1139-1150 E12.6 arcsec e_Reu ?=-99999 Galfit: Error on effective
radius (REERRGALFITBAND_U)
1152-1163 E12.6 arcsec e_Reg ?=-99999 Galfit: Error on effective
radius (REERRGALFITBAND_G)
1165-1176 E12.6 arcsec e_Rer ?=-99999 Galfit: Error on effective
radius (REERRGALFITBAND_R)
1178-1189 E12.6 arcsec e_Rei ?=-99999 Galfit: Error on effective
radius (REERRGALFITBAND_I)
1191-1202 E12.6 arcsec e_Rez ?=-99999 Galfit: Error on effective
radius (REERRGALFITBAND_Z)
1204-1215 E12.6 arcsec e_ReY ?=-99999 Galfit: Error on effective
radius (REERRGALFITBAND_Y)
1217-1228 E12.6 arcsec e_ReJ ?=-99999 Galfit: Error on effective
radius (REERRGALFITBAND_J)
1230-1241 E12.6 arcsec e_ReH ?=-99999 Galfit: Error on effective
radius (REERRGALFITBAND_H)
1243-1254 E12.6 arcsec e_ReK ?=-99999 Galfit: Error on effective
radius (REERRGALFITBAND_K)
1256-1266 F11.6 --- ReCheb0 ?=-99 Galfit: Chebyshev coefficients of
effective radius 0th order
(REGALFITCHEB_0) (3)
1268-1277 F10.6 --- ReCheb1 ?=-99 Galfit: Chebyshev coefficients of
effective radius 1st order
(REGALFITCHEB_1) (3)
1279-1288 F10.6 --- ReCheb2 ?=-99 Galfit: Chebyshev coefficients of
effective radius 2nd order
(REGALFITCHEB_2) (3)
1290-1301 E12.6 --- e_ReCheb0 ?=-99999 Galfit: Error on Chebyshev
coefficients of effective radius
0th order (REERRGALFITCHEB_0)
1303-1314 E12.6 --- e_ReCheb1 ?=-99999 Galfit: Error on Chebyshev
coefficients of effective radius
1st order (REERRGALFITCHEB_1)
1316-1327 E12.6 --- e_ReCheb2 ?=-99999 Galfit: Error on Chebyshev
coefficients of effective radius
2nd order (REERRGALFITCHEB_2)
1329-1331 I3 --- nDOF [0/3]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for
single-sersic sersic index (0=fixed,
1=constant with wavelength, etc)
(NGALFITDEG)
1333-1344 F12.8 --- nu ?=-99 Galfit: Sersic index
(NGALFITBAND_U)
1346-1357 F12.8 --- ng ?=-99 Galfit: Sersic index
(NGALFITBAND_G)
1359-1370 F12.8 --- nr ?=-99 Galfit: Sersic index
(NGALFITBAND_R)
1372-1383 F12.8 --- ni ?=-99 Galfit: Sersic index
(NGALFITBAND_I)
1385-1396 F12.8 --- nz ?=-99 Galfit: Sersic index
(NGALFITBAND_Z)
1398-1409 F12.8 --- nY ?=-99 Galfit: Sersic index
(NGALFITBAND_Y)
1411-1422 F12.8 --- nJ ?=-99 Galfit: Sersic index
(NGALFITBAND_J)
1424-1435 F12.8 --- nH ?=-99 Galfit: Sersic index
(NGALFITBAND_H)
1437-1448 F12.8 --- nK ?=-99 Galfit: Sersic index
(NGALFITBAND_K)
1450-1461 E12.6 --- e_nu ?=-99999 Galfit: Error on Sersic index
(NERRGALFITBAND_U)
1463-1474 E12.6 --- e_ng ?=-99999 Galfit: Error on Sersic index
(NERRGALFITBAND_G)
1476-1487 E12.6 --- e_nr ?=-99999 Galfit: Error on Sersic index
(NERRGALFITBAND_R)
1489-1500 E12.6 --- e_ni ?=-99999 Galfit: Error on Sersic index
(NERRGALFITBAND_I)
1502-1513 E12.6 --- e_nz ?=-99999 Galfit: Error on Sersic index
(NERRGALFITBAND_Z)
1515-1526 E12.6 --- e_nY ?=-99999 Galfit: Error on Sersic index
(NERRGALFITBAND_Y)
1528-1539 E12.6 --- e_nJ ?=-99999 Galfit: Error on Sersic index
(NERRGALFITBAND_J)
1541-1552 E12.6 --- e_nH ?=-99999 Galfit: Error on Sersic index
(NERRGALFITBAND_H)
1554-1565 E12.6 --- e_nK ?=-99999 Galfit: Error on Sersic index
(NERRGALFITBAND_K)
1567-1578 F12.8 --- nCheb0 ?=-99 Galfit: Chebyshev coefficients of
Sersic index 0th order
(NGALFITCHEB_0) (3)
1580-1591 F12.8 --- nCheb1 ?=-99 Galfit: Chebyshev coefficients of
Sersic index 1st order
(NGALFITCHEB_1) (3)
1593-1604 F12.8 --- nCheb2 ?=-99 Galfit: Chebyshev coefficients of
Sersic index 2nd order
(NGALFITCHEB_2) (3)
1606-1617 E12.6 --- e_nCheb0 ?=-99999 Galfit: Error on Chebyshev
coefficients of Sersic index 0th order
(NERRGALFITCHEB_0)
1619-1630 E12.6 --- e_nCheb1 ?=-99999 Galfit: Error on Chebyshev
coefficients of Sersic index 1st order
(NERRGALFITCHEB_1)
1632-1643 E12.6 --- e_nCheb2 ?=-99999 Galfit: Error on Chebyshev
coefficients of Sersic index 2nd order
(NERRGALFITCHEB_2)
1645-1647 I3 --- qDOF [0/1]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for
single-sersic Axial ratio (0=fixed,
1=constant with wavelength, etc)
1649-1658 F10.6 --- qBand ?=-99 Galfit: Axial ratio (QGALFITBAND)
1660-1671 E12.6 --- e_qBand ?=-99999 Galfit: Error on axial ratio
(QERRGALFITBAND)
1673-1675 I3 --- PADOF [0/1]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for
single-sersic Position Angle (0=fixed,
1=constant with wavelength, etc)
(PAGALFITDEG)
1677-1688 E12.6 deg PABand [] Galfit: Position angle on sky,
counterclockwise, 0 is North
(PAGALFITBAND)
1690-1701 E12.6 deg e_PABand ?=-99999 Galfit: Error on position angle
on sky (PAERRGALFITBAND)
1703 I1 --- FlagBD [0/2] Galapagos: Status of B/D fit
(-1=too few images with sufficient data,
0=not started, 1="in progress"= crashed,
2=finished) (FLAGGALFITBD)
1705-1716 E12.6 --- chi2BD ?=-99 Galfit: B/D fit: Chi^2 value of
the fit (CHISQGALFITBD)
1718-1729 E12.6 --- chi2BDP ?=-99 Galfit: B/D fit: Chi^2 value of
the fit (within the SExtractor ellipse
of the primary) (CHISQGALFITBD_PRIME)
1731-1739 I9 --- NDOFBD ?=-99 Galfit: B/D fit: Degree of freedom
(NDOFGALFITBD) (2)
1741-1746 I6 --- NDOFBDP Galfit: B/D fit: Degree of freedom,
within the SExtractor ellipse of the
primary) (NDOFGALFITBD_PRIME) (2)
1748-1759 E12.6 --- chi2nuBD ?=-99 Galfit: B/D fit:
reduced Chi^2 ≡ CHISQ/NDOF
(CHI2NUGALFITBD)
1761-1772 E12.6 --- chi2nuPBD ?=-99 Galfit: B/D fit:
reduced Chi^2 ≡ CHISQ/NDOF (within
the SExtractor ellipse of the primary)
(CHI2NUGALFITBD_PRIME)
1774-1776 I3 --- XDOFBD [1]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for
X-Position in B/D fit (0=fixed,
1=constant with wavelength, etc)
(XGALFITDEG_BD)
1778-1788 F11.6 pix XposBD Galfit: B/D fit: X-position within
postage stamp (XGALFITBD)
1790-1801 E12.6 pix e_XposBD ?=-99999 Galfit: B/D fit: Error on
X-position (XERRGALFITBD)
1803-1805 I3 --- YDOFBD [1]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for
Y-Position in B/D fit (0=fixed,
1=constant with wavelength, etc)
(YGALFITDEG_BD)
1807-1817 F11.6 pix YposBD Galfit: B/D fit: Y-position within
postage stamp (YGALFITBD)
1819-1830 E12.6 pix e_YposBD ?=-99999 Galfit: B/D fit: Error on
X-position (YERRGALFITBD)
1832-1834 I3 --- magDOFB [3/9]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for Bulge
Magnitude (0=fixed, 1=constant with
wavelength, etc) (MAGGALFITDEG_B)
1836-1846 F11.6 mag umagB ?=-999 Galfit: Apparent magnitude of
bulge (MAGGALFITBANDBU)
1848-1858 F11.6 mag gmagB ?=-999 Galfit: Apparent magnitude of
bulge (MAGGALFITBANDBG)
1860-1870 F11.6 mag rmagB ?=-999 Galfit: Apparent magnitude of
bulge (MAGGALFITBANDBR)
1872-1882 F11.6 mag imagB ?=-999 Galfit: Apparent magnitude of
bulge (MAGGALFITBANDBI)
1884-1894 F11.6 mag zmagB ?=-999 Galfit: Apparent magnitude of
bulge (MAGGALFITBANDBZ)
1896-1906 F11.6 mag YmagB ?=-999 Galfit: Apparent magnitude of
bulge (MAGGALFITBANDBY)
1908-1918 F11.6 mag JmagB ?=-999 Galfit: Apparent magnitude of
bulge (MAGGALFITBANDBJ)
1920-1930 F11.6 mag HmagB ?=-999 Galfit: Apparent magnitude of
bulge (MAGGALFITBANDBH)
1932-1942 F11.6 mag KmagB ?=-999 Galfit: Apparent magnitude of
bulge (MAGGALFITBANDBK)
1944-1955 E12.6 mag e_umagB ?=-99999 Galfit: Error on apparent
magnitude of bulge
(MAGERRGALFITBANDBU)
1957-1968 E12.6 mag e_gmagB ?=-99999 Galfit: Error on apparent
magnitude of bulge
(MAGERRGALFITBANDBG)
1970-1981 E12.6 mag e_rmagB ?=-99999 Galfit: Error on apparent
magnitude of bulge
(MAGERRGALFITBANDBR)
1983-1994 E12.6 mag e_imagB ?=-99999 Galfit: Error on apparent
magnitude of bulge
(MAGERRGALFITBANDBI)
1996-2007 E12.6 mag e_zmagB ?=-99999 Galfit: Error on apparent
magnitude of bulge
(MAGERRGALFITBANDBZ)
2009-2020 E12.6 mag e_YmagB ?=-99999 Galfit: Error on apparent
magnitude of bulge
(MAGERRGALFITBANDBY)
2022-2033 E12.6 mag e_JmagB ?=-99999 Galfit: Error on apparent
magnitude of bulge
(MAGERRGALFITBANDBJ)
2035-2046 E12.6 mag e_HmagB ?=-99999 Galfit: Error on apparent
magnitude of bulge
(MAGERRGALFITBANDBH)
2048-2059 E12.6 mag e_KmagB ?=-99999 Galfit: Error on apparent
magnitude of bulge
(MAGERRGALFITBANDBK)
2061-2071 F11.6 --- magCheb0B ?=-999 Galfit: Apparent bulge magnitude
Chebyshev parameter 0th order
(MAGGALFITCHEBB0) (3)
2073-2083 F11.6 --- magCheb1B ?=-999 Galfit: Apparent bulge magnitude
Chebyshev parameter 1st order
(MAGGALFITCHEBB1) (3)
2085-2095 F11.6 --- magCheb2B ?=-999 Galfit: Apparent bulge magnitude
Chebyshev parameter 2nd order
(MAGGALFITCHEBB2) (3)
2097-2107 F11.6 --- magCheb3B ?=-999 Galfit: Apparent bulge magnitude
Chebyshev parameter 3rd order
(MAGGALFITCHEBB3) (3)
2109-2119 F11.6 --- magCheb4B ?=-999 Galfit: Apparent bulge magnitude
Chebyshev parameter 4th order
(MAGGALFITCHEBB4) (3)
2121-2131 F11.6 --- magCheb5B ?=-999 Galfit: Apparent bulge magnitude
Chebyshev parameter 5th order
(MAGGALFITCHEBB5) (3)
2133-2143 F11.6 --- magCheb6B ?=-999 Galfit: Apparent bulge magnitude
Chebyshev parameter 6th order
(MAGGALFITCHEBB6) (3)
2145-2155 F11.6 --- magCheb7B ?=-999 Galfit: Apparent bulge magnitude
Chebyshev parameter 7th order
(MAGGALFITCHEBB7) (3)
2157-2167 F11.6 --- magCheb8B ?=-999 Galfit: Apparent bulge magnitude
Chebyshev parameter 8th order
(MAGGALFITCHEBB8) (3)
2169-2180 E12.6 --- e_magCheb0B ?=-99999 Galfit: Error on Apparent bulge
magnitude Chebyshev parameter 0th order
(MAGERRGALFITCHEBB0)
2182-2193 E12.6 --- e_magCheb1B ?=-99999 Galfit: Error on Apparent bulge
magnitude Chebyshev parameter 1st order
(MAGERRGALFITCHEBB1)
2195-2206 E12.6 --- e_magCheb2B ?=-99999 Galfit: Error on Apparent bulge
magnitude Chebyshev parameter 2nd order
(MAGERRGALFITCHEBB2)
2208-2219 E12.6 --- e_magCheb3B ?=-99999 Galfit: Error on Apparent bulge
magnitude Chebyshev parameter 3rd order
(MAGERRGALFITCHEBB3)
2221-2232 E12.6 --- e_magCheb4B ?=-99999 Galfit: Error on Apparent bulge
magnitude Chebyshev parameter 4th order
(MAGERRGALFITCHEBB4)
2234-2245 E12.6 --- e_magCheb5B ?=-99999 Galfit: Error on Apparent bulge
magnitude Chebyshev parameter 5th order
(MAGERRGALFITCHEBB5)
2247-2258 E12.6 --- e_magCheb6B ?=-99999 Galfit: Error on Apparent bulge
magnitude Chebyshev parameter 6th order
(MAGERRGALFITCHEBB6)
2260-2271 E12.6 --- e_magCheb7B ?=-99999 Galfit: Error on Apparent bulge
magnitude Chebyshev parameter 7th order
(MAGERRGALFITCHEBB7)
2273-2284 E12.6 --- e_magCheb8B ?=-99999 Galfit: Error on Apparent bulge
magnitude Chebyshev parameter 8th order
(MAGERRGALFITCHEBB8)
2286-2288 I3 --- ReDOFB [1]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for bulge
size (0=fixed, 1=constant with
wavelength, etc) (REGALFITDEG_B)
2290-2300 F11.6 arcsec ReB ?=-99 Galfit: Effective radius of bulge
(REGALFITBAND_B)
2302-2313 E12.6 arcsec e_ReB ?=-99999 Galfit: Error on effective
radius of bulge (REERRGALFITBAND_B)
2315-2317 I3 --- nDOFB [0/1]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for bulge
sersic index (0=fixed, 1=constant with
wavelength, etc) (NGALFITDEG_B)
2319-2330 F12.8 --- nB ?=-99 Galfit: Sersic index of bulge
(NGALFITBAND_B)
2332-2343 E12.6 --- e_nB ?=-99999 Galfit: Error on Sersic index of
bulge (NERRGALFITBAND_B)
2345-2347 I3 --- qDOFB [1]?=-99 Galfit: Degree of Freedom in the
Chebyshev polynomial used for bulge
Axial ratio (0=fixed, 1=constant with
wavelength, etc) (QGALFITDEG_B)
2349-2358 F10.6 --- qBandB ?=-99 Galfit: Axial ratio of bulge
(QGALFITBAND_B)
2360-2371 E12.6 --- e_qBandB ?=-99999 Galfit: Error on axial ratio
of bulge (QERRGALFITBAND_B)
2373-2375 I3 --- PADOFB [1]?=-99 Galfit: Degree of Freedom in the
Chebyshev polynomial used for bulge
Position Angle (0=fixed, 1=constant
with wavelength, etc) (PAGALFITDEG_B)
2377-2388 E12.6 deg PABandB []?=-99 Galfit: Position angle of bulge
on sky, counterclockwise, 0 is North
(PAGALFITBAND_B)
2390-2401 E12.6 deg e_PABandB ?=-99999 Galfit: Error on position angle
of bulge on sky (PAERRGALFITBAND_B)
2403-2405 I3 --- magDOFD [3/9]?=-99 Galfit: Degree of Freedom in
the Chebyshev polynomial used for disk
Magnitude (0=fixed, 1=constant with
wavelength, etc) (MAGGALFITDEG_D)
2407-2417 F11.6 mag umagD ?=-999 Galfit: Apparent magnitude of
disk (MAGGALFITBANDDU)
2419-2429 F11.6 mag gmagD ?=-999 Galfit: Apparent magnitude of
disk (MAGGALFITBANDDG)
2431-2441 F11.6 mag rmagD ?=-999 Galfit: Apparent magnitude of
disk (MAGGALFITBANDDR)
2443-2453 F11.6 mag imagD ?=-999 Galfit: Apparent magnitude of
disk (MAGGALFITBANDDI)
2455-2465 F11.6 mag zmagD ?=-999 Galfit: Apparent magnitude of
disk (MAGGALFITBANDDZ)
2467-2477 F11.6 mag YmagD ?=-999 Galfit: Apparent magnitude of
disk (MAGGALFITBANDDY)
2479-2489 F11.6 mag JmagD ?=-999 Galfit: Apparent magnitude of
disk (MAGGALFITBANDDJ)
2491-2501 F11.6 mag HmagD ?=-999 Galfit: Apparent magnitude of
disk (MAGGALFITBANDDH)
2503-2513 F11.6 mag KmagD ?=-999 Galfit: Apparent magnitude of
disk (MAGGALFITBANDDK)
2515-2526 E12.6 mag e_umagD ?=-99999 Galfit: Error on apparent
magnitude of disk
(MAGERRGALFITBANDDU)
2528-2539 E12.6 mag e_gmagD ?=-99999 Galfit: Error on apparent
magnitude of disk
(MAGERRGALFITBANDDG)
2541-2552 E12.6 mag e_rmagD ?=-99999 Galfit: Error on apparent
magnitude of disk
(MAGERRGALFITBANDDR)
2554-2565 E12.6 mag e_imagD ?=-99999 Galfit: Error on apparent
magnitude of disk
(MAGERRGALFITBANDDI)
2567-2578 E12.6 mag e_zmagD ?=-99999 Galfit: Error on apparent
magnitude of disk
(MAGERRGALFITBANDDZ)
2580-2591 E12.6 mag e_YmagD ?=-99999 Galfit: Error on apparent
magnitude of disk
(MAGERRGALFITBANDDY)
2593-2604 E12.6 mag e_JmagD ?=-99999 Galfit: Error on apparent
magnitude of disk
(MAGERRGALFITBANDDJ)
2606-2617 E12.6 mag e_HmagD ?=-99999 Galfit: Error on apparent
magnitude of disk
(MAGERRGALFITBANDDH)
2619-2630 E12.6 mag e_KmagD ?=-99999 Galfit: Error on apparent
magnitude of disk
(MAGERRGALFITBANDDK)
2632-2642 F11.6 --- magCheb0D ?=-999 Galfit: Apparent disk magnitude
Chebyshev parameter 0th order
(MAGGALFITCHEBD0) (3)
2644-2655 F12.6 --- magCheb1D ?=-999 Galfit: Apparent disk magnitude
Chebyshev parameter 1st order
(MAGGALFITCHEBD1) (3)
2657-2667 F11.6 --- magCheb2D ?=-999 Galfit: Apparent disk magnitude
Chebyshev parameter 2nd order
(MAGGALFITCHEBD2) (3)
2669-2679 F11.6 --- magCheb3D ?=-999 Galfit: Apparent disk magnitude
Chebyshev parameter 3rd order
(MAGGALFITCHEBD3) (3)
2681-2691 F11.6 --- magCheb4D ?=-999 Galfit: Apparent disk magnitude
Chebyshev parameter 4th order
(MAGGALFITCHEBD4) (3)
2693-2704 F12.6 --- magCheb5D ?=-999 Galfit: Apparent disk magnitude
Chebyshev parameter 5th order
(MAGGALFITCHEBD5) (3)
2706-2716 F11.6 --- magCheb6D ?=-999 Galfit: Apparent disk magnitude
Chebyshev parameter 6th order
(MAGGALFITCHEBD6) (3)
2718-2728 F11.6 --- magCheb7D ?=-999 Galfit: Apparent disk magnitude
Chebyshev parameter 7th order
(MAGGALFITCHEBD7) (3)
2730-2740 F11.6 --- magCheb8D ?=-999 Galfit: Apparent disk magnitude
Chebyshev parameter 8th order
(MAGGALFITCHEBD8) (3)
2742-2753 E12.6 --- e_magCheb0D ?=-99999 Galfit: Error on Apparent disk
magnitude Chebyshev parameter 0th order
(MAGERRGALFITCHEBD0)
2755-2766 E12.6 --- e_magCheb1D ?=-99999 Galfit: Error on Apparent disk
magnitude Chebyshev parameter 1st order
(MAGERRGALFITCHEBD1)
2768-2779 E12.6 --- e_magCheb2D ?=-99999 Galfit: Error on Apparent disk
magnitude Chebyshev parameter 2nd order
(MAGERRGALFITCHEBD2)
2781-2792 E12.6 --- e_magCheb3D ?=-99999 Galfit: Error on Apparent disk
magnitude Chebyshev parameter 3rd order
(MAGERRGALFITCHEBD3)
2794-2805 E12.6 --- e_magCheb4D ?=-99999 Galfit: Error on Apparent disk
magnitude Chebyshev parameter 4th order
(MAGERRGALFITCHEBD4)
2807-2818 E12.6 --- e_magCheb5D ?=-99999 Galfit: Error on Apparent disk
magnitude Chebyshev parameter 5th order
(MAGERRGALFITCHEBD5)
2820-2831 E12.6 --- e_magCheb6D ?=-99999 Galfit: Error on Apparent disk
magnitude Chebyshev parameter 6th order
(MAGERRGALFITCHEBD6)
2833-2844 E12.6 --- e_magCheb7D ?=-99999 Galfit: Error on Apparent disk
magnitude Chebyshev parameter 7th order
(MAGERRGALFITCHEBD7)
2846-2857 E12.6 --- e_magCheb8D ?=-99999 Galfit: Error on Apparent disk
magnitude Chebyshev parameter 8th order
(MAGERRGALFITCHEBD8)
2859-2861 I3 --- ReDOFD [1]?=-99 Galfit: Degree of Freedom in the
Chebyshev polynomial used for disk size
(0=fixed, 1=constant with wavelength,
etc) (REGALFITDEG_D)
2863-2873 F11.6 arcsec ReD ?=-99 Galfit: Effective radius of disk
(REGALFITBAND_D)
2875-2886 E12.6 arcsec e_ReD ?=-99999 Galfit: Error on effective
radius of disk (REERRGALFITBAND_D)
2888-2890 I3 --- nDOFD [0]?=-99 Galfit: Degree of Freedom in the
Chebyshev polynomial used for disk
sersic index (0=fixed, 1=constant with
wavelength, etc) (NGALFITDEG_D)
2892-2894 I3 --- nD [1]?=-99 Galfit: Sersic index of disk
(NGALFITBAND_D)
2896-2902 F7.1 --- e_nD [0]?=99999 Galfit: Error on Sersic index
of disk (NERRGALFITBAND_D)
2904-2906 I3 --- qDOFD [1]?=-99 Galfit: Degree of Freedom in the
Chebyshev polynomial used for disk Axial
ratio (0=fixed, 1=constant with
wavelength, etc) (QGALFITDEG_D)
2908-2917 F10.6 --- qBandD ?=-99 Galfit: Axial ratio of disk
(QGALFITBAND_D)
2919-2930 E12.6 --- e_qBandD ?=-99999 Galfit: Error on axial ratio of
disk (QERRGALFITBAND_D)
2932-2934 I3 --- PADOFD [1]?=-99 Galfit: Degree of Freedom in the
Chebyshev polynomial used for disk
Position Angle (0=fixed, 1=constant
with wavelength, etc) (PAGALFITDEG_D)
2936-2947 E12.6 deg PABandD []?=-99 Galfit: Position angle of disk
on sky, counterclockwise, 0 is North
(PAGALFITBAND_D)
2949-2960 E12.6 deg e_PABandD ?=-99999 Galfit: Error on position angle
of disk on sky (PAERRGALFITBAND_D)
--------------------------------------------------------------------------------
Note (1): Single-Sersic fit flag as follows:
-1 = not enough bands with sufficient data; not attempted
0 = not started
1 = fit started, but crashed
2 = fit completed
Note (2): includes number of pixels. Used to derive chi2 and chi2/nu
Note (3): A python script for interpolating the Chebyshev polynomials,
kindly provided by Kalina Nedkova, is available here:
https://github.com/kalinanedkova/mass_size
Equally, a similar IDL script can be provided on request, please email
BorisHaeussler.astro(at)gmail.com
--------------------------------------------------------------------------------
Acknowledgements:
Boris Haeussler, bhaeussl(at)eso.org
(End) Patricia Vannier [CDS] 24-Mar-2022