Properties of X-ray-selected broad absorption-line quasars
dc.contributor.author | Blustin, A. | |
dc.contributor.author | Dwelly, T. | |
dc.contributor.author | Page, M. | |
dc.contributor.author | McHardy, I. | |
dc.contributor.author | Seymour, Nick | |
dc.contributor.author | Kennea, J. | |
dc.contributor.author | Loaring, N. | |
dc.contributor.author | Mason, K. | |
dc.contributor.author | Sekiguchi, K. | |
dc.date.accessioned | 2017-01-30T11:49:57Z | |
dc.date.available | 2017-01-30T11:49:57Z | |
dc.date.created | 2016-09-12T08:37:03Z | |
dc.date.issued | 2008 | |
dc.identifier.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. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/15458 | |
dc.identifier.doi | 10.1111/j.1365-2966.2008.13825.x | |
dc.description.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. | |
dc.publisher | Oxford University Press | |
dc.title | Properties of X-ray-selected broad absorption-line quasars | |
dc.type | Journal Article | |
dcterms.source.volume | 390 | |
dcterms.source.number | 3 | |
dcterms.source.startPage | 1229 | |
dcterms.source.endPage | 1240 | |
dcterms.source.issn | 0035-8711 | |
dcterms.source.title | Monthly Notices of the Royal Astronomical Society | |
curtin.department | Department of Physics and Astronomy | |
curtin.accessStatus | Open access via publisher |
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