J/A+A/568/A114ivo://CDS.VizieR/J/A+A/568/A114doi:10.26093/cds/vizier.35680114CDSMeusinger H.Balafkan N.2015-02-07T17:25:58Z2014-09-03T08:30:39ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiquasarsA tiny fraction of the quasar population shows remarkably weak emission lines. Several hypotheses have been developed, but the weak line quasar (WLQ) phenomenon still remains puzzling. The aim of this study was to create a sizeable sample of WLQs and WLQ-like objects and to evaluate various properties of this sample. We performed a search for WLQs in the spectroscopic data from the Sloan Digital Sky Survey Data Release 7 based on Kohonen self-organising maps for nearly 10^5^ quasar spectra. The final sample consists of 365 quasars in the redshift range z=0.6-4.2 (z{bar}=1.50+/-0.45) and includes in particular a subsample of 46 WLQs with equivalent widths W_MgII_<11{AA} and W_CIV_<4.8{AA} We compared the luminosities, black hole masses, Eddington ratios, accretion rates, variability, spectral slopes, and radio properties of the WLQs with those of control samples of ordinary quasars. Particular attention was paid to selection effects.2014A&A...568A.114Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/568/A114CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/328 : AllWISE Data Release (Cutri+ 2013)II/311 : WISE All-Sky Data Release (Cutri+ 2012)VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/A+A/525/A37 : QSOs variability indexes in SDSS Stripe 82 (Meusinger+, 2011)J/A+A/560/A104 : UV variability of quasars (Meusinger+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/568/A114https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/568/A114http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/568/A114https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/568/A114https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/568/A114http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/568/A114GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/568/A114/wlq (SDSS quasars with weak emission lines)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/568/A114/wlq?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/568/A114/wlq?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/568/A114/wlq?GETtext/xml+votable180.050000true0.03925-10.46441670.0055555555555555566/4096 4098 4155 4163 4226 4259 4299 4305 4350 4352 4369 4401 4457 4476 4523-4524 4543 4598 4600 4613 4629 4635 4653 4669 4685 4715 4719 4749 4793 4805 4813 4820 4863 4878 4915 4917 4960 4964 4999 5047 5077 5093-5094 5100 5107 5163 5187 5190 5214-5215 5219 5243 5301 5314 5364 5376 5383 5412 5417 5441 5455 5479 5486 5510 5545 5584 5652 5665 5670 5751 5755 5781-5782 5827 5853 5902 5942 5957 5975 5983 5995 6019 6065 6068 6096 6116-6117 6129 6141 6143 6230 6244 6415-6416 6464 6491 6501 6514 6552 6556 6912 7173 7216 7218 7248 7299 7330 7354 7428 7446 8210 8214 8233 8299 8302 8329 8338 8377 8424 8521 8674 8717 8741 8746 8891 8982-8983 9024 9051 9071 9143 9196 9253 9270 9318 9327 9341 9354 9426 9429 9434 9463 9472 9514 9609 9646 9656 9730 9735 9752 9785 9787-9788 9798 9929 9982 9988 10122 10283 10315 10350 10364 10397 10410 10422 10429 10524 10527 10561 10566 10570 10577 10586 10599 10623 10625-10626 10638 10658 10673 10695 10816 10833 10881 10903 10931 10983 11000 11007 11014 11017 11027 11034 11060 11076 11117 11120 11133 11146-11147 11154 11158 11194 11208 11224 11229 11240-11241 11263 11326 11338-11339 11364 11370 11397 11440 11454 11585 11592 11854 11881-11882 11928 11942 11960 17215 17230 17249-17250 17313-17314 17666 17752 17773 17805 17809 17826-17827 17829 17834 17999 18011 18086 18089 18526 18583 18591 18625 18777 18779 19046 19093 19102 19114 19412 19426 19741 19748 19841 19996 23072 23195 23212-23213 25932 25936 25962 26010 26069 26102 26159 26174 26190 26208 26331 26336 26371 26398 26412 26416 26424 26464 26597 26980-26981 27022 27025 27029 27045 27063-27064 27069 27082 27087 27097 27101 27128 27236 27257 27320 27335 27342 27350 27396 27433 27472 27516 27565 27591 27593 27644 27656 27669 27671 27706 27747 27769 27863 27907 27922 27957 27964 28026 28044 28148 28170 28172 28179 28276 28298 28307 28344 28360 28364 28366 28401 28432 28468 28470 28476 28484 28530 28554 28578 28605 28635 28647 30035-30036 31403 31424 31634 32439 32509 32680 36719 36727 36733 36785-36786 49007 491238.157980699529898e-21 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/568/A114?format=asciiOpticaldefaultJ/A+A/568/A114/wlqSDSS quasars with weak emission linesRflag[-1/2] FIRST radio flag (1) (5)meta.codeintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS designation (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharzSpectroscopic redshift (1)src.redshiftfloatEWMgII? Equivalent width of MgII (1)0.1nmspect.line.eqWidthfloatnullableEWCIV? Equivalent width of CIV (1)0.1nmspect.line.eqWidthfloatnullablelogL3000? log luminosity at 300nm (3000{AA}) (1)log(1e-07W)phys.luminosityfloatnullablelogLbollog Bolometric luminosity (1)log(1e-07W)phys.luminosityfloatalpha[-2.8/0.2]? Spectral index (2)spect.indexfloatnullablelogMbhlog black hole mass (1)log(solMass)phys.massfloatlogEddlog Eddington ratio (1)phys.luminosity;arith.ratiofloatlogAcc? log accretion rate (2)log(solMass.yr**-1)phys.mass.lossdoublenullableumag? SDSS u band PSF magnitude (1)magphot.mag;em.opt.Ufloatnullablegmag? SDSS g band PSF magnitude (1)magphot.mag;em.opt.Bfloatnullablermag? SDSS r band PSF magnitude (1)magphot.mag;em.opt.Rfloatnullableimag? SDSS i band PSF magnitude (1)magphot.mag;em.opt.Ifloatnullablezmag? SDSS z band PSF magnitude (1)magphot.mag;em.opt.IfloatnullableW1mag? WISE W1 band magnitude (3)magphot.mag;em.IR.3-4umfloatnullableW2mag? WISE W2 band magnitude (3)magphot.mag;em.IR.4-8umfloatnullableW3mag? WISE W3 band magnitude (3)magphot.flux.density;em.IR.8-15umfloatnullableW4mag? WISE W4 band magnitude (3)magphot.flux.density;em.IR.15-30umfloatnullableRL? Radio loudness (R=F6cm/F2500{AA}) (1)phot.flux;arith.ratiofloatnullablelogVu? u band variability (4)log(mag**2)phot.mag;em.opt.UfloatnullablelogVg? g band variability (4)log(mag**2)src.var.indexfloatnullablelogVr? r band variability (4)log(mag**2)src.varfloatnullablelogVi? i band variability (4)log(mag**2)src.var.indexfloatnullablelogVz? z band variability (4)log(mag**2)src.varfloatnullableSloanDisplay the SDSS data for this quasarmeta.ref.urlcharS11Display the Shen et al., 2011, Cat. J/ApJS/194/45 datameta.ref.urlchar_RAPosition from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition from SDSS name (declination part)degpos.eq.dec;meta.main