J/ApJ/792/L4ivo://CDS.VizieR/J/ApJ/792/L4doi:10.26093/cds/vizier.17929004CDSPan Z.Li J.Lin W.Wang J.Kong X.2017-05-22T15:20:03Z2017-04-13T10:04:01ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsphotometryvisible-astronomysloan-photometryultraviolet-photometrytwo-color-diagramsredshiftedIn this Letter, we analyze the radial ultraviolet-optical color distributions in a sample of low redshift green valley galaxies, with the Galaxy Evolution Explorer (GALEX)+Sloan Digital Sky Survey (SDSS) images, to investigate how the residual recent star formation is distributed in these galaxies. We find that the dust-corrected u-r colors of early-type galaxies (ETGs) are flat out to R_90_, while the colors monotonously turn blue when r>0.5 R_50_ for late-type galaxies (LTGs). More than half of the ETGs are blue-cored and have remarkable positive NUV-r color gradients, suggesting that their star formations are centrally concentrated. The rest have flat color distributions out to R_90_. The centrally concentrated star formation activity in a large portion of ETGs is confirmed by the SDSS spectroscopy, showing that ~50% of the ETGs have EW(H{alpha})>6.0 {AA}. Of the LTGs, 95% show uniform radial color profiles, which can be interpreted as a red bulge plus an extended blue disk. The links between the two kinds of ETGs, e.g., those objects having remarkable "blue-cores" and those having flat color gradients, are less known and require future investigations. It is suggested that the LTGs follow a general model by which quenching first occurs in the core regions, and then finally extend to the rest of the galaxy. Our results can be re-examined and have important implications for the IFU surveys, such as MaNGA and SAMI.2014ApJ...792L...4Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/792/L4CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)J/MNRAS/410/166 : Morphological types from Galaxy Zoo 1 (Lintott+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/792/L4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/792/L4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/792/L4https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/792/L4https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/792/L4http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/792/L4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/792/L4/fig2 (The radial dust-corrected u-r color profiles)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/792/L4/fig2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/792/L4/fig2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/792/L4/fig2?GETtext/xml+votable180.050000true31.9393813.630940.005555555555555556Cone search capability for table J/ApJ/792/L4/fig3 (The radial dust-corrected NUV-r color profiles)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/792/L4/fig3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/792/L4/fig3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/792/L4/fig3?GETtext/xml+votable180.050000true31.9393813.630940.0055555555555555566/548 4104 4109 4152 4160 4230 4236 4244 4246 4301 4349 4364 4366 4378 4515 4521 4554 4639 4647 4651 4653 4708 4800 4838 4878 4898 4917 4926 5018 5019 5042 5045 5103 5174 5192 5423 5514 5515 5521 5534 5536 5559 5616 5689 5787 5872 5883 5907 5957 5989 5990 5998 6000 6015 6028 6046 6053 6054 6076 6213 6243 6269 6438 6518 6520 6528 6532 6535 6556 6576 6584 6603 6616 6626 6638 7175 7297 7300 7305 7323 7326 7342 7353 7355 7374 7441 7484 7553 7566 7601 7680 7681 8197 8199 8201 8202 8203 8206 8211 8212 8213 8214 8217 8222 8223 8226 8244 8247 8248 8266 8267 8288 8290 8302 8343 8344 8345 8365 8388 8392 8418 8469 8471 8492 8509 8702 8827 8957 9000 9063 9151 9354 9440 9448 9463 9466 9605 9614 9626 9642 9807 9812 9813 9840 9939 9943 9945 9948 10104 10114 10145 10202 10303 10330 10397 10538 10882 10967 10976 10992 11001 11041 11059 11068 11112 11127 11141 11219 11259 11405 11407 11418 11520 11826 17502 17515 17578 17747 17761 17764 17766 17771 17809 17999 18003 18026 18061 18084 18385 18407 18410 18527 18535 18767 18777 18838 18842 18844 19023 19038 19093 19109 19120 19413 19417 19432 19647 19663 19983 19988 20007 21847 22762 23054 23103 23144 23150 23183 23187 23192 23201 23203 23204 23232 25919 25938 25940 25947 25974 25981 25982 25983 26044 26046 26063 26067 26073 26102 26106 26247 26286 26324 26386 26562 26966 26995 27058 27059 27060 27066 27073 27074 27086 27087 27088 27092 27098 27101 27114 27119 27120 27122 27125 27128 27239 27250 27257 27313 27347 27394 27399 27426 27437 27442 27446 27447 27459 27462 27464 27470 27513 27516 27603 27640 27725 27739 27743 27773 27868 28033 28036 28126 28149 28263 28449 28535 28551 28557 31399 31407 31422 31423 31447 31477 31530 32510 32511 36781 36783 36862 49014 49120 49128 491302.040811542443644e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/792/L4?format=asciiUVOpticaldefaultJ/ApJ/792/L4/fig2The radial dust-corrected u-r color profileszRedshiftsrc.redshiftdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS identifiermeta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainCode[1.00-4.00] Galaxy code type (G1)src.classfloatBPT[0/4.00] Baldwin et al. 1981 classification (1981PASP...93....5B) (G2)src.classfloatumagSDSS u band magnitude (G3)magphot.mag;em.opt.UfloatgmagSDSS g band magnitude (G3)magphot.mag;em.opt.BfloatrmagSDSS r band magnitude (G3)magphot.mag;em.opt.RfloatimagSDSS i band magnitude (G3)magphot.mag;em.opt.IfloatzmagSDSS z band magnitude (G3)magphot.mag;em.opt.IfloatlogMLog masslog(solMass)phys.massdoubleE(B-V)The (B-V) color excessmagphot.color.excessfloatR50Radius enclosing 50% SDSS r band fluxarcsecphys.angSize;srcfloatR90Radius enclosing 90% SDSS r band fluxarcsecphys.angSize;srcfloatrdevde Vaucouleurs fit scale radius in r bandstat.fit.residual;phys.size.radius;meta.modelledfloatb/aThe de Vaucouleurs fit axial ratiophys.angSize;arith.ratiofloatLiMatched Li et al. 2014 catalog (in preparation) identifier (NNNNNN)meta.idintIndex[1/239] Running index number (G4)meta.idintlogR1Log radius/R50 at first radiusphys.angSize;srcfloatlogR2Log radius/R50 at second radiusphys.angSize;srcfloatlogR3Log radius/R50 at third radiusphys.angSize;srcfloatlogR4Log radius/R50 at fourth radiusphys.angSize;srcfloatlogR5Log radius/R50 at fifth radiusphys.angSize;srcfloat(u-r)1The (u-r) color at first radius (G5)magphot.color;em.opt.U;em.opt.Rdouble(u-r)2The (u-r) color at second radius (G5)magphot.color;em.opt.U;em.opt.Rdouble(u-r)3The (u-r) color at third radius (G5)magphot.color;em.opt.U;em.opt.Rdouble(u-r)4The (u-r) color at fourth radius (G5)magphot.color;em.opt.U;em.opt.Rdouble(u-r)5The (u-r) color at fifth radius (G5)magphot.color;em.opt.U;em.opt.Rdoublee_(u-r)1Error in (u-r)1magstat.errordoublee_(u-r)2Error in (u-r)2magstat.errordoublee_(u-r)3Error in (u-r)3magstat.errordoublee_(u-r)4Error in (u-r)4magstat.errordoublee_(u-r)5Error in (u-r)5magstat.errordoubleTypeGalaxy type; ETG or LTGsrc.classcharColor[0-1] Color code (G6)meta.code;phot.colorintSloanDisplay the online SDSS data for this galaxymeta.ref.urlcharJ/ApJ/792/L4/fig3The radial dust-corrected NUV-r color profilesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS identifiermeta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainzRedshiftsrc.redshiftdoubleCode[1.00-4.00] Galaxy code type (G1)src.classfloatBPT[0/4.00] Baldwin et al. 1981 classification (1981PASP...93....5B) (G2)src.classfloatumagSDSS u band magnitude (G3)magphot.mag;em.opt.UfloatgmagSDSS g band magnitude (G3)magphot.mag;em.opt.BfloatrmagSDSS r band magnitude (G3)magphot.mag;em.opt.RfloatimagSDSS i band magnitude (G3)magphot.mag;em.opt.IfloatzmagSDSS z band magnitude (G3)magphot.mag;em.opt.IfloatlogMLog masslog(solMass)phys.massdoubleE(B-V)The (B-V) color excessmagphot.color.excessfloatR50Radius enclosing 50% SDSS r band fluxarcsecphys.angSize;srcfloatR90Radius enclosing 90% SDSS r band fluxarcsecphys.angSize;srcfloatrdevde Vaucouleurs fit scale radius in r bandphys.angSize;srcfloatb/aThe de Vaucouleurs fit axial ratiophys.angSize;arith.ratiofloatLiMatched Li et al. 2014 catalog (in preparation) identifier (NNNNNN)meta.idintIndex[1/239] Running index number (G4)meta.idintlogR1Log radius/R50 at first radiusphys.angSize;srcfloatlogR2Log radius/R50 at second radiusphys.angSize;srcfloatlogR3Log radius/R50 at third radiusphys.angSize;srcfloatlogR4Log radius/R50 at fourth radiusphys.angSize;srcfloatlogR5Log radius/R50 at fifth radiusphys.angSize;srcfloat(NUV-r)1The (NUV-r) color at first radius (G5)magphot.color;em.UV;em.optdouble(NUV-r)2The (NUV-r) color at second radius (G5)magphot.color;em.UV;em.optdouble(NUV-r)3The (NUV-r) color at third radius (G5)magphot.color;em.UV;em.optdouble(NUV-r)4The (NUV-r) color at fourth radius (G5)magphot.color;em.UV;em.optdouble(NUV-r)5The (NUV-r) color at fifth radius (G5)magphot.color;em.UV;em.optdoublee_(NUV-r)1Error in (NUV-r)1magstat.errordoublee_(NUV-r)2Error in (NUV-r)2magstat.errordoublee_(NUV-r)3Error in (NUV-r)3magstat.errordoublee_(NUV-r)4Error in (NUV-r)4magstat.errordoublee_(NUV-r)5Error in (NUV-r)5magstat.errordoubleTypeGalaxy type; ETG or LTGsrc.classcharColor[0-1] Color code (G6)meta.code;phot.colorint