J/ApJ/779/104ivo://CDS.VizieR/J/ApJ/779/104doi:10.26093/cds/vizier.17790104CDSJun H.D.Im M.2017-10-09T13:34:16Z2015-06-11T09:33:17ZCDS support team

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

cds-question@unistra.frquasarsredshiftedsurveysWe identify and characterize a population of luminous, dust-poor quasars at 0<z<5 that is photometrically similar to objects previously found at z>6. This class of active galactic nuclei is known to show little IR emission from dusty structure, but it is poorly understood in terms of number evolution and dependence on physical quantities. To better understand the properties of these quasars, we compile a rest-frame UV to IR library of 41000 optically selected type 1 quasars with L_bol_>10^45.7^erg/s. After fitting the broadband spectral energy distributions (SEDs) with accretion disk and dust components, we find 0.6% of our sample to be hot dust-poor, with rest-frame 2.3{mu}m to 0.51{mu}m flux density ratios of -0.5dex or less. The dust-poor SEDs are blue in the UV-optical and weak in the mid-IR, such that their accretion disks are less obscured and the hot dust emission traces that of warm dust down to the dust-poor regime. At a given bolometric luminosity, dust-poor quasars are lower in black hole mass and higher in Eddington ratio than general luminous quasars, suggesting that they are in a rapidly growing evolutionary state in which the dust-poor phase appears as a short or rare phenomenon. The dust-poor fraction increases with redshift, and possible implications for their evolution are discussed.2013ApJ...779..104Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/779/104CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/311 : WISE All-Sky Data Release (Cutri+ 2012)VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/MNRAS/434/3104 : QSOs SED shapes from optical to NIR (Hao+, 2013)J/MNRAS/430/3445 : Covering factor of warm dust in quasars (Ma+, 2013)J/ApJS/206/4 : SED & bolometric corrections for QSOs (Krawczyk+, 2013)J/AJ/144/49 : Quasars from SDSS-DR7, WISE and UKIDSS surveys (Wu+, 2012)J/ApJ/753/125 : NIR spectroscopy follow-up of 60 SDSS-DR7 QSOs (Shen+, 2012)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)J/A+A/512/A34 : XMM-COSMOS Type 1 AGNs (Lusso+, 2010)J/ApJS/180/67 : Photometric selection of QSOs from SDSS. II. (Richards+, 2009)J/MNRAS/392/19 : The 2dF-SDSS QSO survey (Croom+, 2009)J/ApJ/698/1095 : The FIRST-2MASS red QSO survey. II. (Urrutia+, 2009)J/ApJ/692/758 : BAL QSOs in SDSS-DR5 (Gibson+, 2009)J/ApJ/680/169 : SDSS DR5 virial black hole masses (Shen+, 2008)J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)J/ApJ/640/579 : Near-infrared spectra of 27 SDSS quasars (Glikman+, 2006)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/ApJ/779/104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/779/104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/779/104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/779/104https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/779/104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/779/104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/779/104/table2 (Hot dust-poor quasar properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/779/104/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/779/104/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/779/104/table2?GETtext/xml+votable180.050000true4.4757081.1898330.0055555555555555566/4107 4158 4170 4172 4190 4194 4216 4294 4360 4377 4447 4453 4456 4498 4524 4543 4553 4566 4583 4744 4774 4794 4844 4913 4944 4954 4988 5076 5099 5183 5200 5264 5293 5339 5364 5434 5488 5630 5649 5915 5950 5969 5980 6006 6024 6131 6143 6214 6259 6357 6416 6463 6469 6571 6606 6624 6914 7281 7291 7313 7354 7375 7496 8127 8328 8376 8463 8623 8652 8659 8756 8784 8799 8826 8844 8938 8947 8998 9138 9207 9251 9260 9281 9331 9343 9365 9471 9472 9510 9742 9774 9825 9849 9850 9905 9933 9962 10062 10220 10308 10375 10415 10422 10444 10479 10502 10551 10569 10572 10644 10713 10786 10832 10970 10976 11044 11150 11220 11272 11304 11346 11463 11498 11588 11873 11938 12289 12403 12405 17315 17514 17516 17757 17761 17771 17827 17833 18006 18027 18098 18780 18830 19026 19046 19097 19692 20013 22014 23103 24060 25591 25916 25942 25970 26029 26043 26074 26170 26184 26187 26233 26270 26331 26333 26357 26368 26382 26394 26444 26525 26559 26572 26579 26876 26975 27080 27124 27125 27284 27308 27343 27371 27373 27468 27488 27533 27550 27572 27622 27633 27644 27670 27682 27712 27753 27805 27862 27868 27900 27922 27962 28025 28030 28067 28074 28079 28081 28148 28173 28210 28312 28383 28386 28389 28427 28449 28507 30036 31291 31375 31424 31599 31620 31635 31645 31663 31715 32443 32481 45055 49007https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/779/104?format=asciiOpticaldefaultJ/ApJ/779/104/table2Hot dust-poor quasar propertiesSimbadNameSimbad column added by the CDSmeta.idcharl_f2.3Limit flag on f2.3meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQuasar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharz[0.3/4.5] SDSS redshiftsrc.redshiftfloatf2.3[-0.9/-0.5] Log of 2.3{mu}m to optical flux ratio (1)phot.flux;arith.ratiofloate_f2.3[0.01/0.4] Uncertainty in f2.3stat.errorfloatl_f10Limit flag on f10meta.code.errorcharf10[-0.6/0.2]? Log of 10{mu}m to optical flux ratio (1)phot.flux;arith.ratiofloatnullablee_f10[0.02/0.3]? Uncertainty in f10stat.errorfloatnullablelogLbol[45.7/48.1] Log of Bolometric luminosity; in erg/s unitslog(1e-07W)phys.luminosityfloate_logLbol[0.004/0.1] Uncertainty in logLbollog(1e-07W)stat.errorfloatlogMBH[7.7/10.1]? Log of black hole masslog(solMass)phys.massfloatnullablee_logMBH[0.01/1.1]? Uncertainty in logMBHlog(solMass)stat.errorfloatnullablefEdd[0.02/5]? Eddington ratio f_Edd_phot.flux;arith.ratiofloatnullablee_fEdd[0.004/3]? Uncertainty in FEddstat.errorfloatnullableDR9Display the SDSS-DR9 photometric catalog (V/139) within 0.5"meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Names (right ascension part)degpos.eq.ra;meta.main_DEPositions from Names (declination part)degpos.eq.dec;meta.main