J/ApJ/658/778ivo://CDS.VizieR/J/ApJ/658/778doi:10.26093/cds/vizier.16580778CDSYan L.Sajina A.Fadda D.Choi P.Armus L.Helou G.Teplitz H.,Frayer D.Surace J.2017-06-21T08:22:40Z2010-04-23T10:21:55ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcesredshiftedspectroscopyactive-galactic-nucleiinfrared-photometryWe present the mid-infrared spectra obtained with the Spitzer IRS for 52 sources, selected as infrared luminous, z>~1 candidates in the Extragalactic First Look Survey (XFLS). The sample selection criteria are F24um>~0.9mJy, vFv(24um)/vFv(8um)>~3.16, and vFv(24um)/vFv(0.7um)>~10. Of the 52 spectra, 47 (90%) produced measurable redshifts based solely on the mid-IR spectral features, with 35/47 (74%) at 1.5<~z<~3.2. Keck spectroscopy of a subsample (17/47) agrees with the mid-IR redshift measurements. The observed spectra fall into three categories: (1) 33% (17/52) have strong PAH emission and are probably powered by star formation with total IR luminosity roughly a factor of 5 higher than the local starburst ULIRGs; (2) 33% (17/52) have only deep silicate absorption at 9.8um, indicating deeply embedded dusty systems -these data alone cannot determine the energetic nature of the heating sources in these systems; and (3) the remaining 34% are mid-IR continuum-dominated systems with weak PAH emission and/or silicate absorption. This subsample is probably AGNs.2007ApJ...658..778Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/658/778CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/125/2411 : SIRTF First-Look Survey (Condon+, 2003)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)J/A+A/467/565 : z=1-3 ULIRGs from the Spitzer SWIRE survey (Berta+, 2007)http://ssc.spitzer.caltech.edu/fls/extragal/ : Extragalactic First Look Surveyhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/658/778https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/658/778http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/658/778https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/658/778https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/658/778http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/658/778GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/658/778/sample (IRS Low-Resolution spectroscopy observation log and measured redshifts and types for our sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/658/778/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/658/778/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/658/778/sample?GETtext/xml+votable180.050000true259.493559.47133330.0055555555555555565/2547 6/10202 10212 10213 102148.27688880188539e-21 2.483060040379131e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/658/778?format=asciiOpticalInfrareddefaultJ/ApJ/658/778/table3The Keck spectroscopy of the IRS samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInst[NLD] Instrument used for data (1)instr.setupcharMIPSMIPS identification numbermeta.id;meta.mainintzKeckRedshift from Kecksrc.redshiftfloatzIRSRedshift from IRSsrc.redshiftfloatIRSSource type classified from the IRSmeta.notecharKeckSource type from the optical spectrameta.notecharJ/ApJ/658/778/sampleIRS Low-Resolution spectroscopy observation log and measured redshifts and types for our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_MIPSSimbad column added by the CDSmeta.ref.urlcharMIPSMIPS identification numbermeta.id;meta.mainintprimarySST24SST24 identification (JHHMMSS.ss+DDMMSS.s)meta.idcharF24umFlux at 24ummJyphot.flux.density;em.IR.15-30umdoubleF8umFlux at 8umuJyphot.flux.density;em.IR.8-15umfloatFRFlux at R-band (or 2{sigma} limit)uJyphot.flux.density;em.opt.RfloatSL1IRS Short-Low first order resolution (7.4-14.5um)stime.resolutioncharLL2IRS Long-Low second order resolution (14-21.3um)stime.resolutioncharLL1IRS Long-Low first order resolution (19.5-38um)stime.resolutioncharq_z[ab-] Redshift quality flag (1)meta.code.qual;src.redshiftcharz? Redshift (no redshift for Type=4)src.redshiftfloatnullablee_z? Redshift uncertaintystat.error;src.redshiftfloatnullablelogL5.8? Estimated rest-frame luminosity at 5.8umlog(solLum)phys.luminosity;em.IR.8-15umfloatnullablee_logL5.8? Uncertainty in logL5.8umlog(solLum)stat.errorfloatnullableTypeSpectral group classification (2)src.classfloatFeatSpectral features used for redshift measurementsmeta.notechar_RAPosition from SST24 Name (right ascension part)degpos.eq.ra;meta.main_DEPosition from SST24 Name (declination part)degpos.eq.dec;meta.main