J/MNRAS/493/87ivo://CDS.VizieR/J/MNRAS/493/87doi:10.26093/cds/vizier.74930087CDSTrujillo I.Chamba N.Knapen J.H.2024-08-20T20:16:59Z2023-10-03T15:29:13ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryvisible-astronomysloan-photometryredshiftedgalaxy-classification-systemsPresent-day multiwavelength deep imaging surveys allow to characterize the outskirts of galaxies with unprecedented precision. Taking advantage of this situation, we define a new physically motivated measurement of size for galaxies based on the expected location of the gas density threshold for star formation. Employing both theoretical and observational arguments, we use the stellar mass density contour at 1M_{sun}/pc^2^ as a proxy for this density threshold for star formation. This choice makes our size definition operative. With this new size measure, the intrinsic scatter of the global stellar mass (M*)-size relation (explored over five orders of magnitude in stellar mass) decreases to ~0.06dex. This value is 2.5 times smaller than the scatter measured using the effective radius (~0.15dex) and between 1.5 and 1.8 times smaller than those using other traditional size indicators such as R_23.5,i_ (~0.09dex), the Holmberg radius RH (~0.09dex), and the half-mass radius R_e,M*_ (~0.11dex). Moreover, galaxies with 10^7^M_{sun}<M*<10^11^M_{sun}_ increase monotonically in size following a power law with a slope very close to 1/3, equivalent to an average stellar mass 3D density of ~4.5x10^-3^M_{sun}_/pc^3% for galaxies within this mass range. Galaxies with M*>10^11^M_{sun}_ show a different slope with stellar mass, which is suggestive of a larger gas density threshold for star formation at the epoch when their star formation peaks.2020MNRAS.493...87Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/493/87CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/186/427 : Detailed morphology of SDSS galaxies (Nair+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/493/87https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/493/87http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/493/87https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/493/87https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/493/87http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/493/87GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/493/87/table2 (Characteristics of the galaxies used in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/87/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/87/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/87/table2?GETtext/xml+votable180.050000true0.0325417-0.04058060.0055555555555555565/4437-4438 4441 4453-4454 4457 4501-4502 4505 4517-4518 4521 4693 4697-4698 4758 4774 4777 5798 5802 7509 6/0 2 12290 17406-17407 17661-17663 17726-17727 17741-17742 17745-17747 17756-17758 17761 17763 17768 17770 17772-17773 17776-17778 17784 17805-17807 17809-17811 17820-17821 17825 17827 17832-17833 17835-17838 17840-17842 17856-17858 17981-17983 17997-17999 18001-18003 18012-18014 18017-18019 18024-18025 18027-18030 18032-18034 18061 18063 18065-18066 18076-18078 18081 18083 18088-18089 18092-18093 18096-18098 18112-18114 18176-18178 18685-18687 18750-18751 18765-18767 18771 18776 18778-18779 18781-18782 18786 18796 18798 18800-18802 18829 18833-18834 18836 18838-18840 18844-18846 18849-18851 18853-18858 18860-18862 18864-18866 18880-18881 18883 19006-19007 19021-19023 19026-19029 19031 19036 19038 19041-19045 19047-19049 19051-19052 19054 19056 19058 19085-19086 19090-19092 19094-19095 19101 19105-19107 19112-19114 19116-19117 19120-19121 19138 19200-19202 19456-19458 23101-23103 23144 23147 23150 23181 23183 23186-23188 23196-23198 23201-23206 23212-23213 23216 23218 23232-23234 30034-30035 30040-30041 30044 36861-36863 49150-49151https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/493/87?format=asciiOpticaldefaultJ/MNRAS/493/87/table2Characteristics of the galaxies used in this workrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier (JHHMMSS.ss+DDMMSS.ss) (1)meta.id;meta.maincharRAdegRight ascension (J2000) (1)degpos.eq.raDEdegDeclination (J2000) (1)degpos.eq.decqAxial ratiophys.size.axisRatiofloatPA[] Position angle (measured counter-clockwise starting from the horizontal axis)degpos.posAngfloatAgGalactic extinctions in the g bandmagphys.absorptionfloatArGalactic extinctions in the r bandmagphys.absorptionfloatAiGalactic extinctions in the i bandmagphys.absorptionfloatzSpectroscopic redshift (1)src.redshiftfloatTTypeMorphological type (2)src.morph.typeintReEffective radius (measured in the g-band)kpcphys.size.radiusfloatRhalfMassHalf-mass radiuskpcphys.size.radiusfloatRHHolmberg radiuskpcphys.size.radiusfloatSimbadNameSimbad column added by the CDSmeta.idcharnullableR235iRadius corresponding to the location of the isophote with {mu}_i_=23.5mag/arcsec^2^kpcphys.size.radiusfloatR1Radial location of the isomass contour at 1M_{sun}/pc^2^kpcspect.dopplerVelocfloatlogM*Stellar mass of galaxies (assuming a Chabrier IMF)log(solMass)phys.massfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main