2008MNRAS.390.1229B -
Mon. Not. R. Astron. Soc., 390, 1229-1240 (2008/November-1)
Properties of X-ray-selected broad absorption-line quasars.
BLUSTIN A.J., DWELLY T., PAGE M.J., McHARDY I.M., SEYMOUR N., KENNEA J.A., LOARING N.S., MASON K.O. and SEKIGUCHI K.
Abstract (from CDS):
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/cm2, 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.
Abstract Copyright:
© 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s):
quasars: absorption lines - quasars: individual: CXOU J014546.9-043031 - quasars: individual: CXOU J014517.1-042503 - quasars: individual: CXOU J014553.9-043726 - quasars: individual: CXOU J014546.5-042450 - quasars: individual: CXOCDFS J033209.5-274807 - ultraviolet: galaxies
Simbad objects:
12
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