J/ApJ/730/125ivo://CDS.VizieR/J/ApJ/730/125doi:10.26093/cds/vizier.17300125CDSZamojski M.Yan L.Dasyra K.Sajina A.Surace J.Heckman T.Helou G.2017-09-22T16:16:40Z2012-11-13T15:05:06ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourceshst-photometryredshiftedgalaxy-classification-systemsWe present new results on the physical nature of infrared-luminous sources at 0.5<z<2.8 as revealed by HST/NICMOS imaging and Infrared Spectrograph mid-infrared spectroscopy. Our sample consists of 134 galaxies selected at 24um with a flux of S(24um)>0.9mJy. We find many (~60%) of our sources to possess an important bulge and/or central point source component, most of which reveal additional underlying structures after subtraction of a best-fit Sersic (or Sersic+PSF) profile. Based on visual inspection of the NIC2 images and their residuals, we estimate that ~80% of all our sources are mergers. We calculate lower and upper limits on the merger fraction to be 62% and 91%, respectively. At z<1.5, we observe objects in early (pre-coalescence) merging stages to be mostly disk and star formation dominated, while we find mergers to be mainly bulge dominated and active galactic nucleus (AGN)-starburst composites during coalescence and then AGN dominated in late stages. This is analogous to what is observed in local ULIRGs. Finally, we observe obscured ({tau}_9.7um_>3.36) quasars to live in faint and compact hosts and show that these are likely high-redshift analogs of local dense-core mergers. We find late-stage mergers to possess predominantly unobscured AGN spectra, but do not observe other morphological classes to carry any specific combination of {tau}_9.7um_ and polycyclic aromatic hydrocarbon (PAH) equivalent width.2011ApJ...730..125Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/730/125CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/713/330 : Spitzer observations of major-merger galaxies (Xu+, 2010)J/ApJ/701/1123 : MIR spectroscopic catalog of 150 galaxies (Dasyra+, 2009)J/ApJS/177/148 : HST survey. II. Atlas of mergers & companions (Floyd+, 2008)J/MNRAS/376/1251 : 610MHz observations of Spitzer XFLS (Garn+, 2007)J/ApJ/658/778 : Spitzer mid-IR spectroscopy of z~2 ULIRGs (Yan+, 2007)J/AJ/131/250 : Spitzer 70 and 160um observations in xFLS (Frayer+, 2006)J/AJ/131/2859 : Extragalactic First Look Survey: 24{mu}m data (Fadda+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/730/125https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/730/125http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/730/125https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/730/125https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/730/125http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/730/125GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/730/125/table5 (Morphology of the 24um-selected galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/730/125/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/730/125/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/730/125/table5?GETtext/xml+votable180.050000true259.286116759.22806940.0055555555555555565/2547 6/10202 10212 10213 10214https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/730/125?format=asciiOpticalInfrareddefaultJ/ApJ/730/125/table5Morphology of the 24um-selected galaxiesSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMIPS[34/22725] MIPS identification number (<[YSF2007] MIPS NNNNN> or <[DYH2009] MIPS NNNNN> in Simbad)meta.id;meta.mainintf_MIPS[a] Flag on MIPS42 (1)meta.codecharz[0.24/3.49]? Redshiftsrc.redshiftfloatnullableHmag[17.27/23.71]? HST/NICMOS H-band magnitudemagphot.mag;em.IR.Hfloatnullableu_r1/2[~] Uncertainty flag on r1/2meta.code.errorcharr1/2[0.17/9.11]? Half-light radiuskpcphys.size.radiusfloatnullablef_r1/2[b] Flag on r1/2 (1)meta.codecharCompDominant component (Bulge, Disk or Ambiguous) (2)meta.notecharMorphMorphological classsrc.morph.typecharConf[1/6]? Confidence level (3)meta.code.qualintnullableOCatDisplay the data from previous papers (Dasyra et al. 2009, Cat. J/ApJ/701/1123 and Yan et al. 2007, Cat. J/ApJ/658/778) and XFLSmeta.ref.urlintnullable_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main