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    Properties of X-ray-selected broad absorption-line quasars

    Access Status
    Open access via publisher
    Authors
    Blustin, A.
    Dwelly, T.
    Page, M.
    McHardy, I.
    Seymour, Nick
    Kennea, J.
    Loaring, N.
    Mason, K.
    Sekiguchi, K.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Blustin, A. and Dwelly, T. and Page, M. and McHardy, I. and Seymour, N. and Kennea, J. and Loaring, N. et al. 2008. Properties of X-ray-selected broad absorption-line quasars. Monthly Notices of the Royal Astronomical Society. 390 (3): pp. 1229-1240.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2008.13825.x
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/15458
    Collection
    • Curtin Research Publications
    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 aox steeper by ~0.5 than normal QSOs, their median aox 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 aox 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. © 2008 The Authors.

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