J/ApJ/858/77ivo://CDS.VizieR/J/ApJ/858/77doi:10.26093/cds/vizier.18580077CDSHasinger G.Capak P.Salvato M.Barger A.J.Cowie L.L.Faisst A.,Hemmati S.Kakazu Y.Kartaltepe J.Masters D.Mobasher B.Nayyeri H.,Sanders D.Scoville N.Z.Suh H.Steinhardt C.Yang F.2021-01-25T09:14:08Z2019-05-06T10:08:54ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyredshiftedvisible-astronomyinfrared-photometrysurveysWe present a catalog of 10718 objects in the COSMOS field, observed through multi-slit spectroscopy with the Deep Imaging Multi-Object Spectrograph (DEIMOS) on the Keck II telescope in the wavelength range ~5500-9800{AA}. The catalog contains 6617 objects with high-quality spectra (two or more spectral features), and 1798 objects with a single spectroscopic feature confirmed by the photometric redshift. For 2024 typically faint objects, we could not obtain reliable redshifts. The objects have been selected from a variety of input catalogs based on multi-wavelength observations in the field, and thus have a diverse selection function, which enables the study of the diversity in the galaxy population. The magnitude distribution of our objects is peaked at I_AB_~23 and K_AB_~21, with a secondary peak at K_AB_~24. We sample a broad redshift distribution in the range 0<z<6, with one peak at z~1, and another one around z~4. We have identified 13 redshift spikes at z>0.65 with chance probabilities <4x10^-4^, some of which are clearly related to protocluster structures of sizes >10Mpc. An object-to-object comparison with a multitude of other spectroscopic samples in the same field shows that our DEIMOS sample is among the best in terms of fraction of spectroscopic failures and relative redshift accuracy. We have determined the fraction of spectroscopic blends to about 0.8% in our sample. This is likely a lower limit and at any rate well below the most pessimistic expectations. Interestingly, we find evidence for strong lensing of Ly{alpha} background emitters within the slits of 12 of our target galaxies, increasing their apparent density by about a factor of 4.2018ApJ...858...77Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/858/77CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)J/ApJS/155/271 : CDF-South: Optical spectroscopy (Szokoly+, 2004)J/ApJS/155/73 : Photometric redshifts of X-ray sources in CDF-S (Zheng+, 2004)J/ApJ/644/100 : SDSS quasars in the COSMOS field (Prescott+, 2006)J/ApJ/671/1227 : Ly{alpha} galaxies at z~4.5 (Dawson+, 2007)J/ApJS/172/29 : XMM-Newton survey in COSMOS field. I. (Hasinger+, 2007)J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)J/ApJS/172/456 : [OII] emitting gal. in COSMOS & SDF fields (Takahashi+, 2007)J/ApJ/693/8 : High-redshift QSOs in the COSMOS survey (Brusa+, 2009)J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009)J/ApJS/184/218 : The zCOSMOS 10k-bright spectroscopic sample (Lilly+, 2009)J/ApJ/696/1195 : COSMOS AGN spectroscopic survey. I. (Trump+, 2009)J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010)J/ApJ/709/572 : COSMOS 70um sources (Kartaltepe+, 2010)J/ApJ/721/98 : Morphology of 70um COSMOS galaxies (Kartaltepe+, 2010)J/ApJS/192/5 : Emission-line galaxies from HETDEX pilot survey (Adams+, 2011)J/ApJ/742/61 : Phot. redshift of AGNs from XMM- and C-COSMOS (Salvato+ 2011)J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012)J/ApJ/759/6 : SEDs of type I AGN in COSMOS. I. XMM-COSMOS (Elvis+, 2012)J/ApJS/198/1 : Photometry catalogs for the Lockman Hole (Fotopoulou+, 2012)J/ApJ/760/128 : Ly{alpha} from 4<z<6 sources in COSMOS (Mallery+, 2012)J/ApJ/755/169 : 3<z<5 quasar luminosity function in COSMOS (Masters+, 2012)J/A+A/556/A55 : Multi-color photometry of star-forming gal. (Ilbert+, 2013)J/MNRAS/443/2679 : GEEC2 spectroscopic survey of Galaxy groups (Balogh+, 2014)J/A+A/575/A40 : [OII] luminosity function (Comparat+, 2015)J/ApJ/806/L35 : NIR spectroscopy of COSMOS FIR galaxies (Kartaltepe+, 2015)J/ApJS/220/12 : FMOS-COSMOS survey III. 0.7<z<2.5 galaxies (Silverman+, 2015)J/ApJ/815/129 : X-ray AGNs with Subaru/FMOS NIR observations (Suh+, 2015)J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)J/ApJ/817/34 : C-COSMOS Legacy sources multiwavelength cat. (Marchesi+, 2016)J/ApJS/225/27 : 3D-HST Survey: grism spectra master catalog (Momcheva+, 2016)J/ApJ/841/111 : C3R2 survey: high-confidence z from DR1 (Masters+, 2017)J/ApJS/234/21 : hCOSMOS: Hectospec survey of gal. in COSMOS (Damjanov+, 2018)http://cosmos.astro.caltech.edu/ : COSMOS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/858/77https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/858/77http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/858/77https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/858/77https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/858/77http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/858/77GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/858/77/table3 (List of spectral identifications)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/858/77/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/858/77/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/858/77/table3?GETtext/xml+votable180.050000true149.3585532.7503010.005555555555555556Cone search capability for table J/ApJ/858/77/table2 (List of observed slit masks)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/858/77/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/858/77/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/858/77/table2?GETtext/xml+votable180.050000true149.954172.128810.0055555555555555565/6814 6/27245 27247 27344https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/858/77?format=asciiOpticalInfrareddefaultJ/ApJ/858/77/table3List of spectral identificationsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier (1)meta.id;meta.maincharRAJ2000[149.3/151] Right Ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000[1.4/3] Declination (J2000)degpos.eq.dec;meta.mainindexedsel[1/960] Subsample identifier (2)meta.idintimag[8/31.5]? I bandpass AB magnitude (3)magphot.mag;em.opt.IfloatnullableKmag[12/30.4]? K bandpass AB magnitude (3)magphot.mag;em.IR.Kfloatnullablezspec[0/6.7]? Spectroscopic redshiftsrc.redshiftfloatnullableQf[0/19] Original spectroscopic quality flag (4=very secure redshift) (4)meta.code.qual;pos.parallax.spectintQ[0/2] Comprehensive spectral quality flag (2=reliable spectroscopic identification; 1=uncertain) (5)meta.code.qualfloatRemarksRemarks (6)meta.notecharCCatDisplay data from COSMOS catalogs (Capak+, 2007, II/284 ; Ilbert+, 2009, J/ApJ/690/1236 and Lilly+, 2009, J/ApJS/184/218) within 0.3"meta.ref.urlintnullableJ/ApJ/858/77/table2List of observed slit masksAirmass[1/3] Airmassobs.airMassfloatGratingGrating (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMaskMaskmeta.id;obscharRAJ2000[9/10] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[1/2] Degree of Declination (J2000)pos.eq.dec;meta.mainPA[-98/303.2] Position angle, east of northdegpos.posAngfloatobsUTC observation datestime.epoch;obsnullableExp[0.3/2] Exposure time, hourshtime.duration;obs.exposurefloatFilterFilter (GG455, GG495 or OG550)meta.id;instr.filtercharNsl[43/123] Number of slits assignedmeta.numberintNz[30/96] Number of high-quality redshifts (Q>=1.5)meta.numberintNsep[0/20] Number of serendipitous sourcesmeta.numberint