J/A+A/632/A15ivo://CDS.VizieR/J/A+A/632/A15doi:10.26093/cds/vizier.36320015CDSLumbreras-Calle A.Mendez-Abreu J.Munoz-Tunon C.2021-03-02T09:40:20Z2019-11-21T15:12:16ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsurveysgalaxiescatalogsgalaxy-classification-systemsphotometryThe morphological evolution of star-forming galaxies provides important clues to understand their physical properties, as well as the triggering and quenching mechanisms of star formation. We analyze the morphology of galaxies hosting star-forming events at low redshift (z<0.36). We aim at connecting morphology and star-formation properties of low-mass galaxies (median stellar mass ~10^8.5^M_{sun}_) beyond the local Universe. We use a sample of medium-band selected star-forming galaxies from the GOODS-North field. H images for the sample are created combining both spectral energy distribution fits and HST data. Using them, we mask the star forming regions to obtain an unbiased two-dimensional model of the light distribution of the host galaxies. For this purpose we use PHI, a new Bayesian photometric decomposition code. We applied it independently to 7 HST bands, from the ultraviolet to the near-infrared, assuming a Sersic surface brightness model. Star-forming galaxy hosts show low Sersic index (with median n~0.9), as well as small sizes (median Re~1.6kpc), and negligible change of the parameters with wavelength (except for the axis ratio, which grows with wavelength in 46% of the sample). Using a clustering algorithm, we find two different classes of star-forming galaxies: A more compact, redder, and high-n (class A) and a more extended, bluer and lower-n one (class B). This separation holds across all seven bands analyzed. In addition, we find evidence that the first class is more spheroidal-like (according to the distribution of observed axis ratios). We compute the color gradients of the host galaxies finding that 48% of the objects where the analysis could be performed show negative gradients, and only in 5% they are positive. The host component of low-mass star-forming galaxies at z<0.36 separates into two different classes, similar to what has been found for their higher mass counterparts. The results are consistent with an evolution from class B to class A. Several mechanisms from the literature, like minor and major mergers, and violent disk instability, can explain the physical process behind the likely transition between the classes.2019A&A...632A..15Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/632/A15CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/632/A15https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/632/A15http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/632/A15https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/632/A15https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/632/A15http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/632/A15GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/632/A15/table2 (Physical properties, synthetic magnitudes, and class to which each galaxy belongs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/632/A15/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/632/A15/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/632/A15/table2?GETtext/xml+votable180.050000true189.323962.19090.0055555555555555566/112521.398457827073138e-19 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/632/A15?format=asciiOpticaldefaultJ/A+A/632/A15/table2Physical properties, synthetic magnitudes, and class to which each galaxy belongsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSHARDS ID (release DR3 beta)meta.id;meta.mainintRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainlogMassStellar mass of the galaxy (taken from 2019A&A...621A..52L)log(solMass)phys.massfloatE_logMassError on logMass (upper value)log(solMass)stat.error;stat.maxfloate_logMassError on logMass (lower value)log(solMass)stat.error;phys.massfloatlogsSFRSpecific star formation rate (SFR/Stellar Mass) (taken from 2019A&A...621A..52L)log(yr**-1)meta.idfloatE_logsSFRError on logsSFR (upper value)log(yr**-1)stat.error;stat.maxfloate_logsSFRError on logsSFR (lower value)log(yr**-1)stat.errorfloatUmagSynthetic AB mag of the Sersic model of the host galaxy in the Johnson U filtermagphot.mag;em.opt.UfloatE_UmagError on Umag (upper value)magstat.error;stat.maxfloate_UmagError on Umag (lower value)magstat.error;phot.magfloatVmag? Synthetic AB mag of the Sersic model of the host galaxy in the Johnson V filtermagphot.mag;em.opt.VfloatnullableE_Vmag? Error on Vmag (upper value)magstat.error;stat.maxfloatnullablee_Vmag? Error on Vmag (lower value)magstat.error;phot.magfloatnullableJmagSynthetic AB mag of the Sersic model of the host galaxy in the Johnson J filtermagphot.mag;em.IR.JfloatE_JmagError on Jmag (upper value)magstat.error;stat.maxfloate_JmagError on Jmag (lower value)magstat.error;phot.magfloatgmagSynthetic AB mag of the Sersic model of the host galaxy in the SDSS g filtermagphot.mag;em.opt.BfloatE_gmagError on gmag (upper value)magstat.error;stat.maxfloate_gmagError on gmag (lower value)magstat.error;phot.magfloatrmag? Synthetic AB mag of the Sersic model of the host galaxy in the SDSS r filtermagphot.mag;em.opt.RfloatnullableE_rmag? Error on rmag (upper value)magstat.error;stat.maxfloatnullablee_rmag? Error on rmag (lower value)magstat.error;phot.magfloatnullableg-rgradg-r color gradient of the host galaxy modelmag.arcsec**-2.kpc**-1arith.grad;phot.colorfloatE_g-rgradError on g-r_grad (upper value)mag.arcsec**-2.kpc**-1stat.error;stat.maxfloate_g-rgradError on g-r_grad (lower value)mag.arcsec**-2.kpc**-1stat.errorfloatClass[A/B] Class of the galaxy (A or B) (1)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/632/A15/table1Photometric parameters obtained from PHI fittingrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSHARDS ID (release DR3 beta)meta.id;meta.mainintFilter? HST filtermeta.id;instr.filtercharchi2? Chi-squared value of the model fittingstat.fit.chi2floatnullablemue? Surface brightness of the Sersic model at the effective radiusmag.arcsec**-2phot.mag.sb;meta.modelledfloatnullableE_mue? Error on mu_e (upper value)mag.arcsec**-2stat.error;stat.maxfloatnullablee_mue? Error on mu_e (lower value)mag.arcsec**-2stat.errorfloatnullableRe? Effective radius of the Sersic modelkpcphys.size.radius;meta.modelledfloatnullableE_Re? Error on Re (upper value)kpcstat.error;stat.maxfloatnullablee_Re? Error on Re (lower value)kpcstat.errorfloatnullablen? Sersic index of the modelstat.fit.paramfloatnullableE_n? Error on n (upper value)stat.error;stat.maxfloatnullablee_n? Error on n (lower value)stat.errorfloatnullableq? Axis ratio of the Sersic modelphys.size.axisRatiofloatnullableE_q? Error on q (upper value)stat.error;stat.maxfloatnullablee_q? Error on q (lower value)stat.errorfloatnullablePA? Position angle of the Sersic modeldegpos.posAng;meta.modelledfloatnullableE_PA? Error on PA (upper value)degstat.error;stat.maxfloatnullablee_PA? Error on PA (lower value)degstat.errorfloatnullable