Properties of X-ray-selected broad absorption-line quasars
Identifieur interne : 000155 ( Main/Exploration ); précédent : 000154; suivant : 000156Properties of X-ray-selected broad absorption-line quasars
Auteurs : A. J. Blustin [Royaume-Uni] ; T. Dwelly ; M. J. Page ; I. M. Mchardy ; N. Seymour [États-Unis] ; J. A. Kennea [États-Unis] ; N. S. Loaring [Afrique du Sud] ; K. O. Mason ; K. Sekiguchi [Japon]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2008-11-01.
Abstract
Broad absorption-line quasars (commonly termed BALQSOs) contain the most dramatic examples of active galactic nucleus (AGN) driven winds. The high absorbing columns in these winds, ∼1024cm−2, ensure that BALQSOs are generally X-ray faint. This high X-ray absorption means that almost all BALQSOs have been discovered through optical surveys, and so what little we know about their X-ray properties is derived from very bright optically selected sources. A small number of X-ray-selected BALQSOs (XBALQSOs) have, however, recently been found in deep X-ray survey fields. In this paper we investigate the X-ray and rest-frame ultraviolet (UV) properties of five XBALQSOs for which we have obtained XMM–Newton EPIC X-ray spectra and deep optical imaging and spectroscopy. We find that, although the XBALQSOs have an αox steeper by ∼0.5 than normal QSOs, their median αox is nevertheless flatter by 0.30 than that of a comparable sample of optically selected BALQSOs (OBALQSOs). We rule out the possibility that the higher X-ray to optical flux ratio is due to intrinsic optical extinction. We find that the amount of X-ray and UV absorption due to the wind in XBALQSOs is similar, or perhaps greater than, the corresponding wind absorption in OBALQSOs, so the flatter αox cannot be a result of weaker wind absorption. We conclude that these XBALQSOs have intrinsically higher X-ray to optical flux ratios than the OBALQSO sample with which we compare them.
Url:
DOI: 10.1111/j.1365-2966.2008.13825.x
Affiliations:
- Afrique du Sud, Japon, Royaume-Uni, États-Unis
- Pennsylvanie, Région de Kantō
- Tokyo, University Park (Pennsylvanie)
- Université d'État de Pennsylvanie
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