Photometric stellar masses for S4G galaxies J/A+A/704/A232 ivo://CDS.VizieR/J/A+A/704/A232 CDS Ebrova I. Bilek M. Eliasek J. 2026-03-02T06:25:50Z 2025-12-12T09:29:31Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr galaxies photometry visible-astronomy galaxy-classification-systems extinction stellar-masses In many areas of extragalactic astrophysics, we need to convert the luminosity of a galaxy into its stellar mass. In this work, we aim to find a simple and effective formula to estimate the stellar mass from the images of galaxies delivered by the currently popular DESI Legacy Imaging Surveys. This survey provides an unsurpassed combination of a deep imaging with an extensive sky coverage in up to four photometric bands. We calibrated the sought formula against a sample of local galaxies observed by the Spitzer Survey of Stellar Structure in Galaxies (S4 G) that was directly dedicated to measure the stellar masses. For the absolute magnitudes Mg and Mr of a galaxy in the Legacy Surveys g and r bands, we find that the stellar masses can be estimated as 0.673Mg-1.108Mr+0.996 with the scatter of 25%. Employing more complex functions does not improve the estimate appreciably, even after including the galaxy ellipticity, Sersic index, or the magnitudes in different Legacy Surveys bands. Generally, measurements in r band were the most helpful ones, while adding z-band measurements did not improve the mass estimate much. We provide a Python-based script photomass_ls.py to automatically download images of any galaxy from the Legacy Surveys database, create image masks, generate GALFIT input files with well-assessed initial values, perform the GALFIT photometry, and calculate the stellar mass estimate. Additionally, we tuned another version of the formula to the magnitudes provided by the Siena Galaxy Atlas 2020 (SGA-2020) with a scatter of 29%. For both - our default and SGA-2020 formula, we offer two alternatives derived from different calibrations of S4G masses that were based on different methods and assumptions. 2025A&A...704A.232E https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/704/A232 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/PASP/122/1397 : Spitzer Survey of Stellar Structure in Galaxies (Sheth+ 2010) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/704/A232 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/704/A232 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/704/A232 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/704/A232 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/704/A232 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/704/A232 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/704/A232/tableb (Galaxy parameters and stellar masses from LS data) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/704/A232/tableb? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/704/A232/tableb? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/704/A232/tableb? 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47456 47458 47552 48605 49010 49118 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/704/A232?format=ascii Optical default J/A+A/704/A232/tableb Galaxy parameters and stellar masses from LS data recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Galaxy name (1) meta.id;meta.main char RAJ2000 Right ascension (J2000) (1) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000) (1) deg pos.eq.dec;meta.main radius Semi-major axis (mu(3.6um)=25.5mag/arcsec2) (1) arcsec phys.angSize;src float Dmean Mean distance (redshift-independent) (1) Mpc pos.distance float logMS4G Stellar mass from S4G catalog (1) log(solMass) phys.mass float AgDES Galactic extinction in g-band mag phys.absorption float ArDES Galactic extinction in r-band mag phys.absorption float AzDES Galactic extinction in z-band mag phys.absorption float Simbad Simbad column added by the CDS meta.ref.url char gmagInt Integrated magnitude in g-band (3) mag phot.mag;em.opt float rmagInt Integrated magnitude in r-band (3) mag phot.mag;em.opt float zmagInt Integrated magnitude in z-band (3) mag phot.mag;em.opt float b/a-g Axis ratio (b/a) in g-band (3) phys.angSize;arith.ratio float b/a-r Axis ratio (b/a) in r-band (3) phys.angSize;arith.ratio float b/a-z Axis ratio (b/a) in z-band (3) phys.angSize;arith.ratio float n-g Sersic index in g-band (3) stat.fit.param float n-r Sersic index in r-band (3) stat.fit.param float n-z Sersic index in z-band (3) stat.fit.param float Re-g Effective radius in g-band (3) arcsec phys.angSize float Re-r Effective radius in r-band (3) arcsec phys.angSize float Re-z Effective radius in z-band (3) arcsec phys.angSize float PA-g [] Position angle (North=0, East=90) in g-band (3) deg pos.posAng float PA-r [] Position angle (North=0, East=90) in r-band (3) deg pos.posAng float PA-z [] Position angle (North=0, East=90) in z-band (3) deg pos.posAng float gMAG Absolute magnitude (corrected, g-band) mag phys.magAbs float rMAG Absolute magnitude (corrected, r-band) mag phys.magAbs float zMAG Absolute magnitude (corrected, z-band) mag phys.magAbs float logMEq1 Stellar mass from Eq.1 (Eskew et al., 2012AJ....143..139E) (4) log(solMass) phys.mass float logMEq2 Stellar mass from Eq.2 (Meidt et al., 2014ApJ...788..144M) (5) log(solMass) phys.mass float logMEq3 Stellar mass from Eq.3 (Querejeta et al. 2015ApJS..219....5Q) (6) log(solMass) phys.mass float z Redshift (heliocentric) src.redshift double Kcorrg K-correction in g-band (2) mag arith.factor;phot.mag float Kcorrr K-correction in r-band (2) mag arith.factor;phot.mag float TT ? Morphological type (RC3) (1) src.morph.type float nullable e_TT ? Uncertainty of morphological type (1) stat.error float nullable