Reddening of ~35000 quasars from SDSS J/AJ/149/203 ivo://CDS.VizieR/J/AJ/149/203 doi:10.26093/cds/vizier.51490203 CDS Krawczyk C.M. Richards G.T. Gallagher S.C. Leighly K.M. Hewett P.C.,Ross N.P. Hall P.B. 2017-12-15T10:55:04Z 2015-06-22T12:11:21Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars interstellar-reddening We explore the extinction/reddening of ~35000 uniformly selected quasars with 0<z{<=}5.3 in order to better understand their intrinsic optical/ultraviolet (UV) spectral energy distributions. Using rest-frame optical-UV photometry taken from the Sloan Digital Sky Survey's (SDSS) 7th data release, cross-matched to WISE in the mid-infrared, 2MASS and UKIDSS in the near-infrared, and GALEX in the UV, we isolate outliers in the color distribution and find them well described by an SMC-like reddening law. A hierarchical Bayesian model with a Markov Chain Monte Carlo sampling method was used to find distributions of power law indices and E(B-V) consistent with both the broad absorption line (BAL) and non-BAL samples. We find that, of the ugriz color-selected type 1 quasars in SDSS, 2.5% (13%) of the non-BAL (BAL) sample are consistent with E(B-V)>0.1 and 0.1% (1.3%) with E(B-V)>0.2. Simulations show both populations of quasars are intrinsically bluer than the mean composite, with a mean spectral index ({alpha}_{lambda}_) of -1.79 (-1.83). The emission and absorption-line properties of both samples reveal that quasars with intrinsically red continua have narrower Balmer lines and stronger high-ionization emission lines, the latter indicating a harder continuum in the extreme-UV and the former pointing to differences in black hole mass and/or orientation. 2015AJ....149..203K https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/203 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012) II/311 : WISE All-Sky Data Release (Cutri+ 2012) II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011) VII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012) VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) J/ApJS/206/4 : SED and bolometric corrections for luminous QSOs J/AJ/125/1711 : Broad Absorption Line Quasars from SDSS (Reichard+, 2003) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/203 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/203 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/203 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/203 https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/203 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/203 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/AJ/149/203/table2 (Individual fit values) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/203/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/203/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/203/table2? GET text/xml+votable 180.0 50000 true 0.0475417 14.9293333 0.005555555555555556 2/20 41 3/65 68 69 71 72 76 78 87 129 130 131 132 136 139 140 142 143 168 169 173 174 178 413 414 415 431 433 434 436 437 439 440 441 442 447 4/264 265 267 268 270 271 280 281 283 292 293 295 297 299 300 301 302 308 311 316 319 336 337 338 341 342 343 345 346 347 352 353 355 356 358 359 360 361 363 365 366 367 368 370 374 375 376 377 378 380 388 389 391 400 401 402 404 405 415 448 449 452 459 462 463 515 532 534 535 537 538 540 542 543 548 549 551 552 553 564 565 566 576 577 579 580 583 587 589 590 591 608 609 610 612 613 614 616 617 619 620 622 640 641 642 646 647 648 649 651 652 653 654 680 681 682 684 686 687 688 689 691 700 701 702 704 706 707 708 736 738 1651 1695 1711 1717 1719 1720 1722 1723 1731 1740 1741 1742 1752 1753 1755 1772 1773 1777 1778 1779 1780 1782 1783 1785 1786 1787 1967 1976 1978 1979 1983 2027 5/1029 1030 1031 1033 1034 1035 1036 1038 1039 1064 1065 1066 1077 1078 1079 1129 1130 1131 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32672 32674 45039 45043 45052 45053 45054 49149 49150 49151 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/149/203?format=ascii Optical default J/AJ/149/203/table2 Individual fit values recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Source identifier (HHMMSS.ss+DDMMSS.s; J2000) meta.id;meta.main char Dal1 [-0.8/0.8] {Delta}{alpha}_{lambda}_, spectral index difference for SMC reddening law (1) spect.index;arith.diff float E_Dal1 [0.05/0.22] Upper uncertainty in Dal1 stat.error;stat.max;spect.index float e_Dal1 [0.04/0.25] Lower uncertainty in Dal1 stat.error;stat.min;spect.index float E(B-V)1 (B-V) color excess with SMC reddening law mag phot.color.excess;em.opt.B;em.opt.V float E_E(B-V)1 [0.003/0.25] Upper uncertainty in E(B-V)1 mag stat.error;phot.color.excess;em.opt.B float e_E(B-V)1 [0.003/0.25] Lower uncertainty in E(B-V)1 mag stat.error;phot.color.excess;em.opt.B float cov(aa)1 {alpha},{alpha} covariance matrix value stat.covariance double cov(EE)1 E(B-V),E(B-V) covariance matrix value stat.covariance double cov(aE)1 {alpha},E(B-V) covariance matrix value stat.covariance double DIC1 [-60/46] Deviance Information Criterion (2) meta.note float Dal2 [-0.5/0.9] {Delta}{alpha}_{lambda}_, Spectral index difference for L14-QSO reddening law (1) spect.index;arith.diff float E_Dal2 Upper limit uncertainty in Dal2 stat.error;stat.max;spect.index float e_Dal2 Lower limit uncertainty in Dal2 stat.error;stat.min;spect.index float E(B-V)2 (B-V) color excess with L14-QSO reddening law mag phot.color.excess;em.opt.B;em.opt.V float E_E(B-V)2 [0.003/0.23] Upper uncertainty in E(B-V)2 mag stat.error;phot.color.excess;em.opt.B float e_E(B-V)2 [0.001/0.10] Lower uncertainty in E(B-V)2 mag stat.error;phot.color.excess;em.opt.B float cov(aa)2 {alpha},{alpha} covariance matrix value (3) stat.covariance double cov(EE)2 E(B-V),E(B-V) covariance matrix value (3) stat.covariance double cov(aE)2 {alpha},E(B-V) covariance matrix value (3) stat.covariance double DIC2 [-44/50] Deviance Information Criterion (2) meta.note float BAL [0/1] Broad Absorption Line (0=Non-BAL, 1=BAL) meta.code;spect.line int objID SDSS object identification (3) meta.id DR7 Display the SDSS-DR7 quasar catalog of Schneider et al. 2010 (cat. VII/260) meta.ref.url char Simbad Simbad column added by the CDS meta.ref.url char _RA Position from source J2000 identifier (right ascension part) deg pos.eq.ra;meta.main indexed _DE Position from source J2000 identifier (declination part) deg pos.eq.dec;meta.main indexed