SDSS J094533.99+100950.1 – the remarkable weak emission line quasar
TLDR
Weak emission line quasars are a rare and puzzling group of objects as discussed by the authors, and their line properties are not consistent with the trends expected at high accretion rates, which may indicate that the quasar active phase consists of several sub-phases, each starting with a fresh build-up of the Broad Line Region.Abstract:
Weak emission line quasars are a rare and puzzling group of objects. In this paper we present one more object of this class found in the Sloan Digital Sky Survey (SDSS). The quasar SDSS J094533.99+100950.1, lying at z = 1.66, has practically no CIV emission line, a red continuum very similar to the second steepest of the quasar composite spectra of Richards et al., is not strongly affected by absorption and the MgII line, although relatively weak, is strong enough to measure the black hole mass. The Eddington ratio in this object is about 0.45, and the line properties are not consistent with the trends expected at high accretion rates. We propose that the most probable explanation of the line properties in this object, and perhaps in all weak emission line quasars, is that the quasar activity has just started. A disk wind is freshly launched so the low ionization lines which form close to the disk surface are already observed but the wind has not yet reached the regions where high ionization lines or narrow line components are formed. The relatively high occurrence of such a phenomenon may additionally indicate that the quasar active phase consists of several sub-phases, each starting with a fresh build-up of the Broad Line Region.read more
Citations
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Journal ArticleDOI
DISCOVERY OF EIGHT z ∼ 6 QUASARS FROM Pan-STARRS1
Eduardo Bañados,Bram Venemans,Eric Morganson,Roberto Decarli,Fabian Walter,K. C. Chambers,H-W. Rix,Emanuele Paolo Farina,Xiaohui Fan,Linhua Jiang,Ian D. McGreer,G. De Rosa,R. Simcoe,A. Weiß,Paul A. Price,Jeffrey S. Morgan,W. S. Burgett,Jochen Greiner,Nick Kaiser,R.-P. Kudritzki,Eugene A. Magnier,Nigel Metcalfe,Christopher W. Stubbs,W. E. Sweeney,John L. Tonry,Richard J. Wainscoat,Christopher Waters +26 more
TL;DR: In this article, the authors presented a candidate selection criteria from the Panoramic Survey Telescope & Rapid Response System 1 and follow-up strategy to discover quasars in the redshift range 5.7 lsim z lsim 6.2.
Journal ArticleDOI
X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-line Quasars: Unification with a Geometrically Thick Accretion Disk?
Bin Luo,W. N. Brandt,Patrick B. Hall,Jianfeng Wu,Scott F. Anderson,Gordon P. Garmire,Robert R. Gibson,Richard M. Plotkin,Gordon T. Richards,Donald P. Schneider,Ohad Shemmer,Yue Shen +11 more
TL;DR: In this paper, an X-ray and multi-wavelength study of 33 weak emission-line quasars and 18 supernova analogs of the extreme WLQ, PHL 1811, at z ≈ 0.5 −2.9.
Journal ArticleDOI
Line-driven winds and the UV turnover in AGN accretion discs
Ari Laor,Shane W. Davis +1 more
TL;DR: In this article, the radial structure of an AD with a mass loss term was solved, and the implied AD emission was derived from observations of O stars, and it was shown that Mdot_wind becomes comparable to Mdot typically at a few 10s of GM/c^2.
Journal ArticleDOI
Discovery of eight z ~ 6 quasars from Pan-STARRS1
Eduardo Bañados,Bram Venemans,Eric Morganson,Roberto Decarli,Fabian Walter,K. C. Chambers,H-W. Rix,Emanuele Paolo Farina,Xiaohui Fan,Linhua Jiang,Ian D. McGreer,G. De Rosa,R. Simcoe,A. Weiß,Paul A. Price,Jeffrey S. Morgan,W. S. Burgett,Jochen Greiner,Nick Kaiser,R.-P. Kudritzki,Eugene A. Magnier,Nigel Metcalfe,Christopher W. Stubbs,W. E. Sweeney,John L. Tonry,Richard J. Wainscoat,Christopher Waters +26 more
TL;DR: In this paper, the authors presented candidate selection criteria from the Panoramic Survey Telescope & Rapid Response System 1 and follow-up strategy to discover quasars in the redshift range 5.7 by more than 10%.
Journal ArticleDOI
A Population of X-Ray Weak Quasars: PHL 1811 Analogs at High Redshift
Jianfeng Wu,W. N. Brandt,Patrick B. Hall,Robert R. Gibson,Gordon T. Richards,Donald P. Schneider,Ohad Shemmer,Dennis W. Just,Sarah J. Schmidt +8 more
TL;DR: In this paper, Chandra and XMM-Newton observations of a sample of 10 type 1 quasars selected to have unusual UV emission-line properties (weak and blueshifted high-ionization lines; strong UV Fe emission) similar to those of PHL 1811, a confirmed intrinsically X-ray weak quasar.
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