J/ApJ/766/109ivo://CDS.VizieR/J/ApJ/766/109doi:10.26093/cds/vizier.17660109CDSKim D.Im M.2017-11-10T11:16:29Z2014-12-17T13:41:43ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyinfrared-photometrysloan-photometryredshiftedIn order to understand the past merging history of elliptical galaxies, we studied the optical-near-infrared (NIR) color gradients of 204 elliptical galaxies. These galaxies are selected from the overlap region of the Sloan Digital Sky Survey (SDSS) Stripe 82 and the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). The use of optical and NIR data (g, r, and K) provides large wavelength baselines, and breaks the age-metallicity degeneracy, allowing us to derive age and metallicity gradients. The use of the deep SDSS Stripe 82 images makes it possible for us to examine how the color/age/metallicity gradients are related to merging features. We find that the optical-NIR color and the age/metallicity gradients of elliptical galaxies with tidal features are consistent with those of relaxed ellipticals, suggesting that the two populations underwent a similar merging history on average and that mixing of stars was more or less completed before the tidal features disappeared. Elliptical galaxies with dust features have steeper color gradients than the other two types, even after masking out dust features during the analysis, which can be due to a process involving wet merging. More importantly, we find that the scatter in the color/age/metallicity gradients of the relaxed and merging feature types decreases as their luminosities (or masses) increase at M>10^11.4^M_{sun}_ but stays large at lower luminosities. Mean metallicity gradients appear nearly constant over the explored mass range, but a possible flattening is observed at the massive end.2013ApJ...766..109Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/766/109CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/ApJS/210/22 : Herschel Stripe 82 survey (HerS) first catalog (Viero+, 2014)J/ApJS/196/11 : Bulge+disk decompositions of SDSS galaxies (Simard+, 2011)J/ApJ/727/14 : Merging galaxy cluster A2255 in mid-IR (Shim+, 2011)J/other/RAA/11.309 : Nearby early-type galaxies in Stripe 82 (Jiang+, 2011)J/MNRAS/406/382 : Early-type galaxies in the SDSS Stripe82 (Kaviraj, 2010)J/A+A/463/455 : Nearby early-type gal. with ionized gas. III. (Annibali+, 2007)J/ApJ/650/148 : GOODS blue early-type galaxies (Lee+, 2006)J/AJ/130/2647 : Tidal features of 126 nearby red galaxies (van Dokkum+, 2005)J/ApJ/571/136 : DEEP Groth Strip survey. X. (Im+, 2002)J/AJ/100/1091 : UBR photometry of 39 elliptical galaxies (Peletier+ 1990)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/766/109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/766/109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/766/109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/766/109https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/766/109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/766/109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/766/109/table2 (List of ellipticals and their properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/766/109/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/766/109/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/766/109/table2?GETtext/xml+votable180.050000true319.50360110.57086810.0055555555555555565/4502 5798 6/12290 17406 17662 17663 17727 17745 17747 17750 17752 17753 17756 17763 17765 17768 17770 17777 17784 17806 17807 17809 17810 17811 17813 17815 17818 17820 17821 17838 17983 17999 18003 18004 18006 18014 18017 18018 18019 18021 18022 18028 18030 18032 18065 18068 18074 18083 18087 18093 18114 18686 18751 18772 18773 18777 18778 18786 18789 18792 18794 18837 18844 18845 18855 18881 18883 19007 19022 19023 19031 19048 19051 19058 19090 19091 19099 19101 19105 19107 19111 19112 19113 19115 19120 19121 19201 23101 23103 23138 23147 23150 23182 23186 23187 23197 23198 23201 23202 23206 23208 23209 23211 23218 23232 23233 30036 30044 30045 30064 36861 36862 49147https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/766/109?format=asciiOpticalInfrareddefaultJ/ApJ/766/109/table2List of ellipticals and their propertiesz[0.01/0.05] redshiftsrc.redshiftfloate_g(g-r)Uncertainty in g(g-r)stat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[24/3726] Kaviraj, 2010, J/MNRAS/406/382 catalog identifiermeta.idintreffr[1.6/27] The r band effective radiusarcsecphys.angSizefloatreffK[1.6/18] The K band effective radiusarcsecphys.angSize;em.IR.Kfloatg(g-r)The (g-r) color gradient (1)arith.grad;phot.colorfloatg(r-K)[-1.8/1.1] The (r-K) color gradient (1)arith.grad;phot.colorfloate_g(r-K)Uncertainty in g(r-K)stat.errorfloatg(g-K)The (g-K) color gradient (1)arith.grad;phot.colorfloate_g(g-K)Uncertainty in g(g-K)stat.errorfloatg(t)[-1.4/4.8] The age gradient (2)arith.gradfloate_g(t)[0/3.3] Uncertainty in g(t)stat.errorfloatg(Z)[-2.7/1.7] The metallicity gradient (2)arith.grad;phys.abundfloate_g(Z)Uncertainty in g(Z)stat.errorfloatKMag[-24.4/-21.3] Absolute K band AB magnitudemagphys.magAbs;em.IR.Kfloate_KMag[0/0.05] Uncertainty in KMagmagstat.error;phot.mag;em.IR.KfloatlogM*[10.6/11.9] Log stellar mass from KMaglog(solMass)phys.massfloate_logM*[0/0.02] Uncertainty in logM*log(solMass)stat.errorfloatB/T[0.5/1] Bulge to total light ratiophys.composition.massLightRatiofloatType[RTD] Morpological type: R=relaxed, T=tidal-feature, D=dust-feature.meta.code;src.morphcharSDSSIAU SDSS-DR7 namemeta.id;meta.maincharSloanDisplay the online SDSS data for this galaxymeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Kaviraj, 2010, Cat. J/MNRAS/406/38 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Kaviraj, 2010, Cat. J/MNRAS/406/38 (declination part)degpos.eq.dec;meta.main