J/ApJS/217/11ivo://CDS.VizieR/J/ApJS/217/11doi:10.26093/cds/vizier.22170011CDSLiu W.-J.Zhou H.Ji T.Yuan W.Wang T.-G.Jian G.Shi X.Zhang S.,Jiang P.Shu X.Wang H.Wang S.-F.Sun L.Yang C.Liu B.Zhao W.2017-06-20T13:17:37Z2015-05-05T14:17:57ZCDS support team

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

cds-question@unistra.frquasarsredshiftedline-intensitiessurveysNeutral helium multiplets, HeI*{lambda}{lambda}3189, 3889, 10830, are very useful diagnostics for the geometry and physical conditions of the absorbing gas in quasars. So far only a handful of HeI* detections have been reported. Using a newly developed method, we detected the HeI*{lambda}3889 absorption line in 101 sources of a well-defined sample of 285 MgII broad absorption line (BAL) quasars selected from SDSS DR5. This has increased the number of HeI* BAL quasars by more than one order of magnitude. We further detected HeI*{lambda}3189 in 50% (52/101) of the quasars in the sample. The detection fraction of HeI* BALs in MgII BAL quasars is ~35% as a whole, and it increases dramatically with increasing spectral signal-to-noise ratio (S/N), from ~18% at S/N<=10 to ~93% at S/N>=35. This suggests that HeI* BALs could be detected in most MgII LoBAL quasars, provided the spectra S/N is high enough. Such a surprisingly high HeI* BAL fraction is actually predicted from photoionization calculations based on a simple BAL model. The result indicates that HeI* absorption lines can be used to search for BAL quasars at low z, which cannot be identified by ground-based optical spectroscopic surveys with commonly seen UV absorption lines. Using HeI*{lambda}3889, we discovered 19 BAL quasars at z<0.3 from the available SDSS spectral database. The fraction of HeI* BAL quasars is similar to that of LoBAL objects.2015ApJS..217...11Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/217/11CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)VII/243 : SDSS quasar catalog. III. (Schneider+, 2005)J/AJ/145/157 : Reddening curve of IRAS 14026+4341 (Jiang+, 2013)J/PASJ/65/8 : Catalog of SDSS quasar absorption redshift (Qin+, 2013)J/ApJ/773/14 : BOSS: quasar luminosity function (Ross+, 2013)J/ApJ/761/184 : IR luminosities for dusty AGNs and QSOs (Weedman+, 2012)J/ApJ/757/51 : FIRST-2MASS dust-reddened QSO spectra (Glikman+, 2012)J/ApJ/748/131 : MgII absorbers in SDSS-DR7 quasar catalog (Shen+, 2012)J/ApJ/736/86 : FeII emission in SDSS type 1 AGNs (Dong+, 2011)J/A+A/525/A37 : QSO variability indexes in SDSS Stripe 82 (Meusinger+, 2011)J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)J/ApJ/709/611 : The multi-component absorber QSO 0318-0600 (Dunn+, 2010)J/ApJ/692/758 : BAL QSOs in SDSS-DR5 (Gibson+, 2009)J/MNRAS/399/2231 : SDSS DR5 BALQSO catalog (Scaringi+, 2009)J/MNRAS/383/581 : Broad-line Balmer decrements in blue AGN (Dong+, 2008)J/ApJ/665/990 : SDSS DR2 BAL QSOs (Ganguly+, 2007)J/MNRAS/371/495 : Catalog of 1806 MgII absorbers from SDSS DR3 (Bouche+, 2006)J/ApJS/165/1 : BAL QSOs from SDSS DR3 (Trump+, 2006)J/ApJ/640/579 : Near-infrared spectra of 27 SDSS quasars (Glikman+, 2006)J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004)J/AJ/125/1711 : Broad Absorption Line Quasars from SDSS (Reichard+, 2003)J/AJ/121/2308 : Sloan Digital Sky Survey quasar photometry (Richards+, 2001)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/ApJS/217/11https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/217/11http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/217/11https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/217/11https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/217/11http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/217/11GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/217/11/HeI (The HeI^*^ BAL quasars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/11/HeI?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/11/HeI?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/11/HeI?GETtext/xml+votable180.050000true0.038583315.29847220.005555555555555556Cone search capability for table J/ApJS/217/11/table3 (The parent sample of MgII BAL quasars in the SDSS-DR5)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/11/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/11/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/11/table3?GETtext/xml+votable180.050000true0.038583315.29847220.005555555555555556Cone search capability for table J/ApJS/217/11/table6 (Low-z BAL AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/11/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/11/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/11/table6?GETtext/xml+votable180.050000true22.821416716.42652780.0055555555555555566/552 4102 4106 4131 4150 4208 4241 4358 4369 4471 4670 4715 4769 4784 4818 4826 4839 4877 4890 4898 4907 4981 5004 5088 5102 5107 5187 5313 5327 5333 5341 5355 5360 5367 5372 5397 5414 5452 5456 5461 5484 5486 5498 5503 5533 5570 5590 5607 5617 5619 5687 5722 5795 5804 5832 5847 5856 5898 5903 5918 5933 5943 5944 5946 5950 5970 5971 5985 5986 6057 6077 6121 6123 6224 6417 6419 6443 6457 6465 6498 6512 6515 6554 6594 6598 6913 7178 7182 7207 7234 7241 7254 7256 7262 7265 7281 7284 7289 7300 7352 7376 7443 7449 7450 7455 7488 7681 7684 8662 8739 9170 9187 9193 9217 9220 9273 9311 9325 9359 9417 9431 9435 9519 9615 9618 9636 9642 9774 9796 9814 9817 9855 9882 9901 9911 9972 9973 9998 10114 10362 10428 10495 10571 10574 10590 10593 10614 10673 10728 10839 10856 10899 10971 10997 11044 11065 11081 11091 11191 11235 11247 11266 11273 11296 11311 11323 11326 11335 11382 11406 11410 11451 11461 11474 11789 11797 11807 11819 11829 11849 11856 11913 11928 17301 17306 17324 17507 17750 17757 17806 17817 18023 18026 18029 18385 18386 18390 18393 18410 18419 18611 18766 18787 18851 18859 18953 19037 19043 19106 19122 19202 19389 19663 19696 19752 22003 22012 23050 25599 25924 25927 25943 25994 25995 26002 26028 26044 26046 26064 26072 26075 26083 26195 26225 26254 26272 26278 26284 26378 26379 26386 26479 26498 26583 26592 26603 26951 26989 27030 27042 27094 27114 27260 27290 27310 27342 27379 27410 27411 27453 27459 27594 27617 27650 27653 27683 27685 27727 27751 27758 27766 27776 27782 27826 27854 27856 27883 27889 27954 27982 28179 28655 30040 31354 31419 31421 31423 32399 32435 32456 32503 36763 36775 36781 36784 36788 36809 36862 45044 45051 49106https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/217/11?format=asciiOpticaldefaultJ/ApJS/217/11/HeIThe HeI^*^ BAL quasarsHeISimbad column added by the CDSmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS identifier (JHHMMSS.ss+DDMMSS.s) (1)meta.id;meta.maincharm_SDSSMultiple SDSS flag (1)meta.code.multipcharz[0.1/1.4] Redshiftsrc.redshiftfloatcSimbad column added by the CDSmeta.ref.urlcharlambdaWavelength of the HeI multipletem.wl;phys.atmol.transitionintnullableEW[0.4/6] Equivalent width of HeI; Angstroms0.1nmspect.line.eqWidthfloate_EW[0.1/2] Uncertainty in EW0.1nmstat.error;spect.line.eqWidthfloatdabsMaximum depth of HeI absorption troughphot.flux.density;arith.ratiofloatvmaxMaximum velocity of HeI absorption trough (2)km/sspect.dopplerVelocintvminMinimum velocity of HeI absorption trough (2)km/sspect.dopplerVelocintvavg[-16631/404] Weighted average HeI absorption trough velocitykm/sspect.dopplerVelocintS/N[2.6/44.3] Median He I Signal-to-Noiseem.wl.central;stat.medianfloatFiberSDSS spectrum Fibermeta.noteintPlateSDSS spectrum Platemeta.noteintMJDSDSS spectrum MJDdtime.epochint_RAPositions from SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS names (declination part)degpos.eq.dec;meta.mainJ/ApJS/217/11/table3The parent sample of MgII BAL quasars in the SDSS-DR5HeISimbad column added by the CDSmeta.notecharm_SDSSMultiple SDSS flagmeta.code.multipcharRefReference code(s) (5)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNspNumber of spectra (when multiple spectra)meta.numberintnullableSDSSSDSS identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharz[0.3/1.4] Redshiftsrc.redshiftfloatcSimbad column added by the CDSmeta.ref.urlcharEW[1.7/48.3] Equivalent width of MgII; Angstroms0.1nmspect.line.eqWidthfloate_EW[0.2/6] Uncertainty in EW (1)0.1nmstat.error;spect.line.eqWidthfloatAI[171/4917]? MgII absorption Index (2)km/sspect.line.widthintnullabledabs[0/1] Maximum depth of MgII absorption troughphot.flux.density;arith.ratiofloatvmaxMaximum velocity of MgII absorption trough (3)km/sspect.dopplerVelocintvminMinimum velocity of MgII absorption trough (3)km/sspect.dopplerVelocintvavg[-21195/107] Weighted average MgII absorption trough velocitykm/sspect.dopplerVelocintS/N[1.4/59] Median MgII Signal-to-Noise (4)em.wl.central;stat.medianfloatFiberSDSS spectrum Fibermeta.noteintPlateSDSS spectrum Platemeta.noteintMJDSDSS spectrum MJDdtime.epochintBCatDisplay data from SDSS BAL QSOs catalogs (Trump et al. 2006, J/ApJS/165/1 andGibson et al. 2009, J/ApJ/692/758) within 1"meta.ref.urlintnullableSpInteractive spectrum from SDSSmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS names (declination part)degpos.eq.dec;meta.mainJ/ApJS/217/11/table6Low-z BAL AGNsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS identifier (JHHMMSS.ss+DDMMSS.s) (1)meta.id;meta.maincharz[0.1/1.4] Redshiftsrc.redshiftfloatEW[0.4/6] Equivalent width of HeI; Angstroms0.1nmspect.line.eqWidthfloate_EW[0.1/2] Uncertainty in EW0.1nmstat.error;spect.line.eqWidthfloatdabsMaximum depth of HeI absorption troughphot.flux.density;arith.ratiofloatvmaxMaximum velocity of HeI absorption trough (2)km/sspect.dopplerVelocintvminMinimum velocity of HeI absorption trough (2)km/sspect.dopplerVelocintvavg[-16631/404] Weighted average HeI absorption trough velocitykm/sspect.dopplerVelocintS/N[2.6/44.3] Median He I Signal-to-Noiseem.wl.central;stat.medianfloatFiberSDSS spectrum Fibermeta.noteintPlateSDSS spectrum Platemeta.noteintMJDSDSS spectrum MJDdtime.epochintSpInteractive spectrum from SDSSmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS names (declination part)degpos.eq.dec;meta.mainJ/ApJS/217/11/tablea2UV continuum and emission-line parameters of the entire parent samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNspNumber of spectra (when multiple spectra)meta.numberintnullableSDSSSDSS identifiermeta.id;meta.maincharz[0.3/1.4] Redshiftsrc.redshiftfloatMgNumber of MgII features (table3)meta.numberintnullablecSimbad column added by the CDSmeta.ref.urlcharbeta[-4.8/5.1]? Continuum slope {beta} between ~3000 and 4000{AA}spect.indexfloatnullablelogL3000[44/46.6] Log luminosity at 3000 Angstromslog(1e-07W)phys.luminosityfloatlogF2500[-16.7/-14.6] Log flux at 2500 Angstromslog(cW.m**-2.nm**-1)phot.fluxfloatlogFFe2[-15.3/-12.4]? Log UV FeII line fluxlog(mW.m**-2)phot.fluxfloatnullableFWHM[717/11377]? Full-Width at Half-Maximum of broad MgII linekm/sspect.line.widthintnullablelogFMg2b[-15.9/-13.2]? Log broad MgII component fluxlog(mW.m**-2)phot.fluxfloatnullablelogFMg2n[-17/-14.3]? Log narrow MgII component fluxlog(mW.m**-2)phot.fluxfloatnullablelogMBH[6.6/9.8]? Log SM black hole mass (G1)log(solMass)phys.massfloatnullableL/LEdd[0.02/5]? Luminosity in Eddington unitsphys.luminosityfloatnullableJ/ApJS/217/11/tablea3Optical continuum and emission-line parameters of the z<0.8 objects in the parent samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNspNumber of spectra (when multiple spectra)meta.numberintnullableSDSSSDSS identifiermeta.id;meta.maincharz[0.3/0.8] Redshiftsrc.redshiftfloatMgNumber of MgII features (table3)meta.numberintnullablelogL5100[43.8/45.5] Log luminosity at 5100 Angstromslog(1e-07W)phys.luminosityfloatFWHMHb[1197/14057] Full-Width at Half-Maximum of broad H{beta} linekm/sspect.line.widthintlogFHbb[-15/-12.9]? Log broad H{beta} component fluxlog(mW.m**-2)phot.fluxfloatnullablelogFHbn[-17/-14.4]? Log narrow H{beta} component fluxlog(mW.m**-2)phot.fluxfloatnullableFWHMO3[-15.6/-13]? Full-Width at Half-Maximum of [OIII] linekm/sspect.line.widthfloatnullableLogFO3[241/4650]? Log [OIII] line fluxlog(mW.m**-2)phot.flux;em.line.OIII;spect.lineintnullablelogFFe2[-16.4/-13.3]? Log optical FeII line fluxlog(mW.m**-2)phot.fluxfloatnullablelogMBH[7.5/9.1]? Log SM black hole mass (G1)log(solMass)phys.massfloatnullableL/LEdd[0.02/0.4]? Luminosity in Eddington unitsphys.luminosityfloatnullableJ/ApJS/217/11/tablea4Duplicate spectroscopic observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNspNumber of spectra (when multiple spectra)meta.numberintnullableSDSSObject identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharz[0.4/1.4] Redshiftsrc.redshiftfloatMJDModified Julian Date of the observationdtime.epochintPlatePlate identifiermeta.id;instr.plateintFiberFiber identifiermeta.idintDateDate of the observationtime.epochnullableObsSource of the observation (BOSS or SDSS)meta.id;obscharHeI*HeI^*^(3889) absorption detection code (0 = detection failure in spectrum)meta.codeintSpInteractive spectrum from SDSSmeta.ref.urlchar