Properties of X‐ray‐selected broad absorption‐line quasars
Identifieur interne : 000183 ( Main/Exploration ); précédent : 000182; suivant : 000184Properties 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.
English descriptors
- KwdEn :
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, ∼1024 cm−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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Loaring</name></noRegion></country><country name="Japon"><region name="Région de Kantō"><name sortKey="Sekiguchi, K" sort="Sekiguchi, K" uniqKey="Sekiguchi K" first="K." last="Sekiguchi">K. Sekiguchi</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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