J/MNRAS/406/382ivo://CDS.VizieR/J/MNRAS/406/382doi:10.26093/cds/vizier.74060382CDSKaviraj S.2024-07-12T20:14:21Z2014-12-17T13:02:40ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomysloan-photometryredshiftedgalaxy-classification-systemsultraviolet-photometryWe explore the properties of "peculiar" early-type galaxies (ETGs) in the local Universe that show (faint) morphological signatures of recent interactions such as tidal tails, shells and dust lanes. Standard-depth (~51s exposure) multicolour galaxy images from the Sloan Digital Sky Survey (SDSS) are combined with the significantly (~2mag) deeper monochromatic images from the public SDSS Stripe82 (-50{deg}<{alpha}<59{deg}, -1.25{deg}<{delta}<1.25{deg}) to extract, through careful visual inspection, a robust sample of nearby (z<0.05), luminous (M_r_<-20.5) ETGs, including a subset of ~70 peculiar systems. ~18% of ETGs exhibit signs of disturbed morphologies (e.g. shells), while ~7% show evidence of dust lanes and patches. An analysis of optical emission-line ratios indicates that the fraction of peculiar ETGs that are Seyferts or LINERs (19.4%) is twice the corresponding values in their relaxed counterparts (10.1%). LINER-like emission is the dominant type of nebular activity in all ETG classes, plausibly driven by stellar photoionization associated with recent star formation. An analysis of ultraviolet-optical colours indicates that, regardless of the luminosity range being considered, the fraction of peculiar ETGs that have experienced star formation in the last Gyr is a factor of ~1.5 higher than that in their relaxed counterparts. The spectrophotometric results strongly suggest that the interactions that produce the morphological peculiarities also induce low-level recent star formation which, based on the recent literature, are likely to contribute a few per cent of the stellar mass over the last ~1Gyr. Peculiar ETGs preferentially inhabit low-density environments (outskirts of clusters, groups or the field), either due to high peculiar velocities in clusters making merging unlikely or because shell systems are disrupted through frequent interactions within a cluster crossing time.2010MNRAS.406..382Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/406/382CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/335 : GALEX-GR6/7 data release (Bianchi+ 2014)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/ApJS/210/22 : Herschel Stripe82 survey (HerS) catalog (Viero+, 2014)J/ApJ/766/109 : Metallicity gradients of elliptical gal. (Kim+, 2013)J/other/RAA/11.309 : Nearby early-type galaxies in Stripe 82 (Jiang+, 2011)J/ApJS/186/427 : Detailed morphology of SDSS galaxies (Nair+, 2010)J/ApJ/697/1369 : GOODS Ks-selected multiwavelength compil. (Bundy+, 2009)J/MNRAS/388/1537 : Galaxy pairs from SDSS-DR2 (McIntosh+, 2008)J/AJ/134/579 : SDSS-DR3 morphologically classified galaxies (Fukugita+, 2007)J/ApJS/162/1 : MUSYC: optical source catalog (Gawiser+, 2006)J/AJ/130/2647 : Tidal features of 126 nearby red galaxies (van Dokkum+, 2005)J/AJ/126/1183 : Major galaxy mergers at z<~3 (Conselice+, 2003)J/AJ/125/1817 : SDSS Early-Type Galaxies Catalog (Bernardi+, 2003)J/ApJ/565/208 : Galaxy pairs in the CNOC2 Redshift Survey (Patton+, 2002)http://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/406/382https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/406/382http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/406/382https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/406/382https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/406/382http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/406/382GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/406/382/catalog (Catalogue of SDSS Stripe82 galaxies sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/406/382/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/406/382/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/406/382/catalog?GETtext/xml+votable180.050000true321.9151919-1.1021750.0055555555555555565/4441-4442 4453-4454 4501-4502 4504-4506 4517-4518 4521 4693-4694 4758 4774 4777-4778 5798 5802 7509 6/0-2 12289-12290 17406 17661-17663 17726-17727 17741-17743 17745-17747 17749-17753 17755-17758 17761-17763 17772-17773 17776-17778 17784 17805-17807 17809-17811 17820-17821 17828 17830 17832 17835-17836 17838 17841 17856-17858 17981 17983 17998-17999 18001-18003 18012 18014 18028 18030 18032-18034 18061 18063 18065-18066 18076-18078 18082-18083 18088-18089 18092-18093 18098 18112-18114 18176 18686 18750-18751 18765-18767 18769 18771 18781 18786 18788-18790 18792 18794-18796 18802 18833-18834 18837-18840 18842 18844-18846 18854-18855 18858 18864-18866 18880-18881 18883 19007 19021-19023 19025 19028 19031 19038 19042 19045 19047-19049 19051 19054 19058 19085 19090-19091 19093 19100-19102 19105 19107 19116 19120-19122 19137 19200-19201 19456 23101-23103 23138 23144 23146-23147 23150 23181-23183 23185-23187 23190-23191 23196-23198 23201-23206 23212-23214 23216 23218 23232-23234 30040 30043-30046 30064 36861-36862 49147 49150https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/406/382?format=asciiUVOpticaldefaultJ/MNRAS/406/382/catalogCatalogue of SDSS Stripe82 galaxies sampleSDSSIAU SDSS-DR7 namemeta.id;meta.maincharSeq[2/3726] Sequence numbermeta.idintprimaryobjIDSDSS object IDmeta.idRAJ2000[0.05/359.5] SDSS right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-1.25/1.25] SDSS declination (J2000)degpos.eq.dec;meta.mainz[0.01/0.05] SDSS redshiftsrc.redshiftdoubleumag0[14.7/19.6] SDSS-DR7 u de-reddened magnitudemagphot.mag;em.opt.Ufloate_umag0[0.005/0.4] umag0 uncertaintymagstat.error;pos.cartesian.xfloatgmag0[12.9/17.1] SDSS-DR7 g de-reddened magnitudemagphot.mag;em.opt.Bfloate_gmag0[0.001/0.01] gmag0 uncertaintymagstat.error;phot.magfloatrmag0[12/16.2] SDSS-DR7 r-band de-reddened magnitudemagphot.mag;em.opt.Rfloate_rmag0[0.001/0.02] rmag0 uncertaintymagstat.error;phot.magfloatimag0[11.6/15.9] SDSS-DR7 i de-reddened magnitudemagphot.mag;em.opt.Ifloate_imag0[0.001/0.02] imag0 uncertaintymagstat.error;phot.magfloatzmag0[11.3/15.8] SDSS-DR7 z de-reddened magnitudemagphot.mag;em.opt.Ifloate_zmag0[0.001/0.04] zmag0 uncertaintymagstat.error;phot.magfloatNUV[15/23]? GALEX NUV dereddened magnitude (DR4)magphot.mag;em.UVfloatnullablee_NUV[0.002/1]? NUV uncertaintymagstat.errorfloatnullablerMag[-23.2/-20.5] Absolute r-band magnitude M(r)magphys.magAbsfloatMhalo[0/14.8]? Dark matter halo mass from Yang et al. (2007ApJ...671..153Y; log scale)log(solMass)phys.massfloatnullableETG[1/7] Morphological ETG classification (1)meta.code;src.morphintSloanDisplay the online SDSS data for this galaxymeta.ref.urlcharDR7Display the details from the SDSS-DR7 photometric catalog (II/294)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar