J/ApJ/733/74ivo://CDS.VizieR/J/ApJ/733/74doi:10.26093/cds/vizier.17330074CDSLemonias J.J.Schiminovich D.Thilker D.Wyder T.K.Martin D.C.,Seibert M.Treyer M.A.Bianchi L.Heckman T.M.Madore B.F.Rich R.M.2017-10-16T14:57:33Z2012-12-10T07:22:21ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomysloan-photometryultraviolet-photometryWe present results of the first unbiased search for extended ultraviolet (XUV)-disk galaxies undertaken to determine the space density of such galaxies. Our sample contains 561 local (0.001<z<0.05) galaxies that lie in the intersection of available Galaxy Evolution Explorer (GALEX) deep imaging (exposure time >1.5x10^4^s) and Sloan Digital Sky Survey DR7 footprints. We explore modifications to the standard classification scheme for our sample that includes both disk- and bulge-dominated galaxies. Visual classification of each galaxy in the sample reveals an XUV-disk frequency of up to 20% for the most nearby portion of our sample. On average over the entire sample (out to z=0.05) the frequency ranges from a hard limit of 4%-14%. The GALEX imaging allows us to detect XUV disks beyond 100 Mpc. The XUV regions around XUV-disk galaxies are consistently bluer than the main bodies. We find a surprisingly high frequency of XUV emission around luminous red (NUV-r>5) and green valley (3<NUV-r<5) galaxies. The XUV-disk space density in the local universe is >(1.5-4.2)x10^-3^Mpc^-3^. Using the XUV emission as an indicator of recent gas accretion, we estimate that the cold gas accretion rate onto these galaxies is >(1.7-4.6)x10^-3^M_{sun}_/Mpc^3^/yr. The number of XUV disks in the green valley and the estimated accretion rate onto such galaxies points to the intriguing possibility that 7%-18% of galaxies in this population are transitioning away from the red sequence.2011ApJ...733...74Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/733/74CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/544/A65 : GALEX Arecibo SDSS survey. VI. (Catinella+, 2012)J/ApJ/741/79 : The Spitzer-SDSS-GALEX Spectroscopic Survey (O'Dowd+, 2011)J/ApJ/731/28 : UV star-forming association in galaxies (Alberts+, 2011)J/AJ/140/1194 : FUV/HI relations in nearby galaxies (Bigiel+, 2010)J/AJ/140/1975 : Normal galaxies optical and UV photometry (Smith+, 2010)J/MNRAS/403/683 : GALEX Arecibo SDSS survey (GASS) (Catinella+, 2010)J/ApJS/173/538 : XUV-Disk galaxies in the Local Universe (Thilker+, 2007)J/ApJS/173/293 : UV-Optical galaxy color-magnitude diagram I. (Wyder+, 2007)J/A+AS/114/527 : UV properties of normal galaxies. III. (Rifatto+, 1995)http://www.sdss.org/ : SDSS home pagehttp://galex.stsci.edu/GR6/ : GALEX GR6 archivehttp://www.mpa-garching.mpg.de/SDSS/DR7/ : The MPA-JHU DR7 of spectrum web pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/733/74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/733/74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/733/74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/733/74https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/733/74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/733/74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/733/74/table1 (Properties of sample galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/733/74/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/733/74/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/733/74/table1?GETtext/xml+votable180.050000true36.88180.87740.0055555555555555565/1517 1519 1528 2547 2574 6522 6/5309 5346 5352 5701 5714 6044 6046 6047 6073 6074 6075 6090 6120 6122 7441 7444 7445 7601 7602 7603 7604 8922 8945 9151 9342 9343 9428 9429 9606 9607 9612 9613 9634 9640 9739 9742 9761 9764 9831 9837 9842 9848 10182 10183 10194 10200 10202 10212 10213 10215 10224 10517 11425 11856 17763 17764 17766 17772 18085 18096 18789 18790 18791 18793 18796 19033 19416 19417 25585 26083 26086 26092 26094 26432 26433 26436 27245 27247 27258 27259 27413 27456 27458 28535 28541 490182.85864675833786e-19 3.5010283109654867e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/733/74?format=asciiUVOpticaldefaultJ/ApJ/733/74/table1Properties of sample galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryDSimbad column added by the CDSmeta.ref.urlcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainz[0.003/0.05] Redshiftsrc.redshiftfloatNUVexpNUV exposure timekstime.duration;obs.exposurefloatFUVexpFUV exposure timekstime.duration;obs.exposure;em.UV.FUVfloatNUV-r[0.04/6.42] The (NUV-r) color indexmagphot.color;em.UV;em.optfloatFUV-r[0.55/8.7] The (FUV-r) color indexmagphot.color;em.UV;em.optfloatrmag[12.17/18.51] SDSS r band magnitudemagphot.mag;em.opt.RfloatlogM*[8/11.54] Log of the masslog(solMass)phys.massfloatCConcentration index; C=R_90_/R_50_meta.notefloatDR7Cross-match with the SDSS-DR7 photometric catalog (Cat. II/294) within 1"meta.ref.urlcharSloanDisplay the SDSS online data for this galaxymeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refcharJ/ApJ/733/74/table2Properties of XUV-disks and XUV-ambiguous galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharFUV-r(XUV)The (FUV-r) color of XUV regionmagphot.color;em.UV;em.optfloatR80/RXUV[0.1/26] The R_80_/R_XUV_ ratio (1)stat.fit.omcfloatType[AD] Source type; D=XUV-disk, A=XUV-amb.src.classcharRej?[NY] Reject; Y=Reject, N=Non-rejectmeta.codechar