J/A+A/667/A87ivo://CDS.VizieR/J/A+A/667/A87doi:10.26093/cds/vizier.36670087CDSChamba N.Trujillo I.Knapen J.H.2024-09-03T20:01:07Z2023-12-13T18:13:37ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyphotometrysloan-photometryThe outskirts of galaxies have been studied from multiple perspectives for the past few decades. However, it is still unknown if all galaxies have clear-cut edges similar to everyday objects. We address this question by developing physically motivated criteria to define the edges of galaxies. Based on the gas density threshold required for star formation, we define the edge of a galaxy as the outermost radial location associated with a significant drop in either past or ongoing in situ star formation. We explore ~1000 low-inclination galaxies with a wide range in morphology (dwarfs to ellipticals) and stellar mass (10^7^M_{sun}_<M*<10^12^M_{sun}_). The location of the edges of these galaxies (R_edge_) were visually identified as the outermost cutoff or truncation in their radial profiles using deep multi-band optical imaging from the IAC Stripe82 Legacy Project. We find this characteristic feature at the following mean stellar mass density, which varies with galaxy morphology: 2.9+/-0.10M_{sun}_/pc^2^ for ellipticals, 1.1+/-0.04M_{sun}_/pc^2^ for spirals, and 0.6+/-0.03 M_{sun}_/pc^2^ for present-day star-forming dwarfs. Additionally, we find that R_edge_ depends on its age (colour) where bluer galaxies have larger R_edge_ at a fixed stellar mass. The resulting stellar mass-size plane using R_edge_ as a physically motivated galaxy size measure has a very narrow intrinsic scatter (<~0.06dex). These results highlight the importance of new deep imaging surveys to explore the growth of galaxies and trace the limits of star formation in their outskirts.2022A&A...667A..87Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/667/A87CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/493/87 : 1005 galaxies with z<0.09 sample (Trujillo+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/667/A87https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/667/A87http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/667/A87https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/667/A87https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/667/A87http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/667/A87GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/667/A87/dwarfs (Dwarf galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/667/A87/dwarfs?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/667/A87/dwarfs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/667/A87/dwarfs?GETtext/xml+votable180.050000true3.722620.388610.005555555555555556Cone search capability for table J/A+A/667/A87/eltgs (Early- and late-type galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/667/A87/eltgs?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/667/A87/eltgs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/667/A87/eltgs?GETtext/xml+votable180.050000true0.459731.031720.0055555555555555565/4438 4441 4454 4501-4502 4517-4518 4521 4693 4774 5802 7509 6/0 2 12290 17406 17661-17663 17726-17727 17742 17745-17747 17749-17751 17756-17758 17761 17763 17768 17770 17772-17773 17776-17778 17805-17807 17809-17811 17813 17815 17820-17821 17829-17830 17832-17833 17835-17838 17840-17842 17856-17857 17981-17983 17998-17999 18001-18003 18012-18014 18017-18022 18027-18030 18032-18034 18061 18063 18065-18066 18076-18078 18081 18088 18092-18093 18096-18098 18112 18114 18176-18178 18685-18687 18751 18765-18767 18771 18776 18778-18779 18781 18786 18788-18790 18792 18794 18796 18798 18800-18802 18829 18833 18836 18838-18840 18844 18849-18851 18853-18857 18860-18862 18864-18866 18880-18881 18883 19006 19021 19023 19027-19028 19032-19034 19038 19041 19044 19047 19049 19051-19052 19054 19056 19058 19085-19086 19090 19094 19101 19105-19107 19109-19111 19114 19116 19120-19121 19138 19200-19202 19456-19458 23101 23103 23147 23181 23183 23186-23187 23192 23194-23195 23197-23198 23201-23206 23212-23213 23216 23218 23232-23234 30035 30040-30041 30044 36861-36863 49151https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/667/A87?format=asciiOpticaldefaultJ/A+A/667/A87/dwarfsDwarf galaxiesRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJIDJ2000 SDSS Object Identification (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharDEJ2000Declination (J2000)degpos.eq.dec;meta.mainAgGalactic extinction in SDSS-g (G1)magphys.absorption.galfloatArGalactic extinction in SDSS-r (G1)magphys.absorption.galfloatAiGalactic extinction in SDSS-i (G1)magphys.absorption.galfloatzSDSS Spectroscopic redshiftsrc.redshiftfloatTType[24] TType classification (1)meta.code.classintReEffective/half-light radiuskpcphys.size.radiusfloatRhalfMassHalf-mass radiuskpcphys.size.radiusfloatR235iIsophotal radius at 23.5 imag/arcsec^2^kpcpos.distance;phys.sizefloatRHHolmberg radius (G2)kpcphys.size.radiusfloatR1Iso-mass radius at 1Msun/pc^2^kpcphys.size.radiusfloatqAxis ratiophys.size.axisRatiodoublePA[] Position angle (G3)degpos.posAngdoubleRedgeEdge radiikpcphys.size.radiusdoubleSigmaedgeSurface stellar density at the edge (G4)solMass.pc**-2src.densitydoublelogMstarLog10 of stellar masslog(solMass)phys.massdoubleJ/A+A/667/A87/eltgsEarly- and late-type galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJIDJ2000 SDSS Object Identification (JHHMMSS.ss+DDMMSS.ss)meta.id;meta.maincharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainAgGalactic extinction in SDSS-g (G1)magphys.absorption.galfloatArGalactic extinction in SDSS-r (G1)magphys.absorption.galfloatAiGalactic extinction in SDSS-i (G1)magphys.absorption.galfloatzSDSS Spectroscopic redshiftsrc.redshiftfloatTTypeTType (1)meta.code.classintReEffective/half-light radiuskpcphys.size.radiusfloatRhalfMassHalf-mass radiuskpcphys.size.radiusfloatR235iIsophotal radius at 23.5 imag/arcsec^2kpcpos.distance;phys.sizefloatRHHolmberg radius (G2)kpcphys.size.radiusfloatR1Iso-mass radius at 1 Msol/pc^2kpcphys.size.radiusfloatqAxis ratiophys.size.axisRatiodoublePA[] Position angle (G3)degpos.posAngdoubleRedgeEdge radiikpcphys.size.radiusdoubleSigmaedgeSurface stellar density at the edge (G4)solMass.pc**-2src.densitydoublelogMstarStellar masssolMassphys.massdoubleJ/A+A/667/A87/dprofSurface brightness and stellar density profiles for dwarf galaxy sampleE_SBr? Upper error bar of SBr (G7)mag.arcsec**-2stat.error;stat.maxdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJIDJ2000 SDSS Object Identification (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharDistDistance from galaxy centre (G5)kpcpos.distancedoubleSBgObserved surface brightness in SDSS-g (G6)mag.arcsec**-2phot.mag.sbdoublee_SBgLower error bar of SBg (G7)mag.arcsec**-2stat.errordoubleE_SBg? Upper error bar of SBg (G7)mag.arcsec**-2stat.error;stat.maxdoublenullablelogSDLog10 of stellar surface densitysolMass.pc**-2src.densitydoublee_logSD? Lower error bar of logSD (G8)solMass.pc**-2stat.errordoublenullableSBrObserved surface brightness in SDSS-r (G6)mag.arcsec**-2phot.mag.sb;em.opt.Rdoublee_SBrLower error bar of SBr (G7)mag.arcsec**-2stat.errordoubleE_logSD? Upper error bar of logSD (G8)solMass.pc**-2stat.error;stat.maxdoublenullableJ/A+A/667/A87/elprofSurface brightness and stellar density profiles for the early- and late-type galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJIDJ2000 SDSS Object Identification (JHHMMSS.ss+DDMMSS.ss)meta.id;meta.maincharDistDistance from galaxy centre (G5)kpcpos.distancedoubleSBgObserved surface brightness in SDSS-g (G6)mag.arcsec**-2phot.mag.sbdoublee_SBgLower error bar of SBg (G7)mag.arcsec**-2stat.errordoubleE_SBg? Upper error bar of SBg (G7)mag.arcsec**-2stat.error;stat.maxdoublenullableSBrObserved surface brightness in SDSS-r (G6)mag.arcsec**-2phot.mag.sb;em.opt.Rdoublee_SBrLower error bar of SBr (G7)mag.arcsec**-2stat.errordoubleE_SBr? Upper error bar of SBr (G7)mag.arcsec**-2stat.error;stat.maxdoublenullablelogSDLog10 of stellar surface densitysolMass.pc**-2src.densitydoublee_logSDLower error bar of logSD (G8)solMass.pc**-2stat.errordoubleE_logSD? Upper error bar of logSD (G8)solMass.pc**-2stat.error;stat.maxdoublenullable