J/MNRAS/464/3431ivo://CDS.VizieR/J/MNRAS/464/3431doi:10.26093/cds/vizier.74643431CDSHamann F.Zakamska N.L.Ross N.Paris I.Alexandroff R.M.,Villforth C.Richards G.T.Herbst H.Brandt W.N.Cook B.Denney K.D.,Greene J.E.Schneider D.P.Strauss M.A.2024-08-16T20:19:33Z2018-08-29T13:10:37ZCDS support team

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

cds-question@unistra.frquasarsredshiftedline-intensitiesRed quasars are candidate young objects in an early transition stage of massive galaxy evolution. Our team recently discovered a population of extremely red quasars (ERQs) in the Baryon Oscillation Spectroscopic Survey (BOSS) that has a suite of peculiar emission-line properties including large rest equivalent widths (REWs), unusual 'wingless' line profiles, large NV/Ly{alpha}, NV/CIV, SiIV/CIV and other flux ratios, and very broad and blueshifted [OIII] {lambda}5007. Here we present a new catalogue of CIV and NV emission-line data for 216188 BOSS quasars to characterize the ERQ line properties further. We show that they depend sharply on UV-to-mid-IR colour, secondarily on REW(CIV), and not at all on luminosity or the Baldwin Effect. We identify a 'core' sample of 97 ERQs with nearly uniform peculiar properties selected via i-W3>=4.6(AB) and REW(CIV)>=100{AA} at redshifts 2.0-3.4. A broader search finds 235 more red quasars with similar unusual characteristics. The core ERQs have median luminosity <logL(ergs/s)>~47.1, sky density 0.010deg^-2^, surprisingly flat/blue UV spectra given their red UV-to-mid-IR colours, and common outflow signatures including BALs or BAL-like features and large CIV emission-line blueshifts. Their SEDs and line properties are inconsistent with normal quasars behind a dust reddening screen. We argue that the core ERQs are a unique obscured quasar population with extreme physical conditions related to powerful outflows across the line-forming regions. Patchy obscuration by small dusty clouds could produce the observed UV extinctions without substantial UV reddening.2017MNRAS.464.3431Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/464/3431CatalogResearchIsServedByTAP VizieR generic servicerelated-toVII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/464/3431https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/464/3431http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/464/3431https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/464/3431https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/464/3431http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/464/3431GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap9.932213363424795e-25 9.932213363424795e-25defaultJ/MNRAS/464/3431/table2Core ERQ propertiesn_QSO[ab] Note on QSO (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQuasar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharzeBest available emission-line redshift from DR12Q (Paris et al., Cat. VII/270 (Section 3).src.redshift;pos.heliocentricfloatimagi magnitude corrected for Galactic extinctionmagphot.mag;em.opt.Ifloati-W3? i-W3 colour index corrected for Galactic extinctionmagphot.color;em.IR;em.IRfloatnullableREWRest equivalent width of CIV emission line0.1nmspect.line.eqWidthinte_REWrms uncertainty on REW0.1nmstat.errorintFWHMFWHM of CIV emission linekm/sspect.line.width;spect.lineinte_FWHMrms uncertainty on FWHMkm/sstat.error;phys.angSizeintkt80Kurtosis index of CIV emission line (2)src.var.indexfloatNV/CIVLine flux ratio NV/CIVspect.line.intensity;arith.ratiofloatBAL[0/1] Visual inspection flag (bal_flag_vi) from DR12Q (3)meta.codeintalpha? UV continuum slope all from our emission line catalogue ({alpha}{lambda}spect.indexfloatnullableE(B-V)? Selective extinction derived from r, i, z-W1 colours by Hamann et al. (in preparation).magphot.color.excessfloatnullablee_E(B-V)? rms uncertainty on E(B-V)magstat.errorfloatnullableFFIRST? FIRST 20cm radio flux (4)mJyphot.flux.density;em.radio.750-1500MHzfloatnullablen_FFIRST[ND] ND when non-detection with 5{sigma} upper limit ~1mJymeta.notecharJ/MNRAS/464/3431/tableb1ERQ-like quasarsn_FFIRST[ND] ND when non-detection with 5{sigma} upper limit ~1mJymeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQuasar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharn_QSO[ab] Note on QSO (1)meta.notecharzeBest available emission-line redshift from DR12Q (Paris et al., Cat. VII/270 (Section 3).src.redshift;pos.heliocentricfloatimagi magnitude corrected for Galactic extinctionmagphot.mag;em.opt.Ifloati-W3? i-W3 colour index corrected for Galactic extinctionmagphot.color;em.IR;em.IRfloatnullableREWRest equivalent width of CIV emission line0.1nmspect.line.eqWidthinte_REWrms uncertainty on REW0.1nmstat.errorintFWHMFWHM of CIV emission linekm/sspect.line.width;spect.lineinte_FWHMrms uncertainty on FWHMkm/sstat.error;phys.angSizeintkt80Kurtosis index of CIV emission line (2)src.var.indexfloatNV/CIVLine flux ratio NV/CIVspect.line.intensity;arith.ratiofloatBAL[0/1] Visual inspection flag (bal_flag_vi) from DR12Q (3)meta.codeintalpha? UV continuum slope all from our emission line catalogue ({alpha}{lambda}spect.indexfloatnullableE(B-V)? Selective extinction derived from r, i, z-W1 colours by Hamann et al. (in preparation).magphot.color.excessfloatnullablee_E(B-V)? rms uncertainty on E(B-V)magstat.errorfloatnullableFFIRST? FIRST 20cm radio flux (4)mJyphot.flux.density;em.radio.750-1500MHzfloatnullable