Properties of X-ray selected Broad Absorption Line Quasars

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dc.creatorBlustin, A. J.
dc.creatorDwelly, T.
dc.creatorPage, M. J.
dc.creatorMcHardy, I. M.
dc.creatorSeymour, N.
dc.creatorKennea, J. A.
dc.creatorLoaring, N. S.
dc.creatorMason, K. O.
dc.creatorSekiguchi, K.
dc.date2008-08-18
dc.date.accessioned2026-07-07T10:20:25Z
dc.date.available2026-07-07T10:20:25Z
dc.descriptionBroad absorption line quasars (commonly termed BALQSOs) contain the most dramatic examples of AGN-driven winds. The high absorbing columns in these winds, ~10^24 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 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 alpha_ox steeper by ~0.5 than normal QSOs, their median alpha_ox 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 alpha_ox 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.
dc.description13 pages, 8 figures, accepted for publication in MNRAS
dc.identifierhttps://arxiv.org/abs/0808.2414
dc.identifierhttp://arxiv.org/abs/0808.2414
dc.identifierMNRAS (2008), 390, 1229
dc.identifierdoi:10.1111/j.1365-2966.2008.13825.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/174844
dc.subjectAstrophysics
dc.titleProperties of X-ray selected Broad Absorption Line Quasars
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