XMM-Newton Spectroscopy of the Highly Polarized and Luminous Broad Absorption Line Quasar CSO 755

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dc.creatorShemmer, O.
dc.creatorBrandt, W. N.
dc.creatorGallagher, S. C.
dc.creatorVignali, C.
dc.creatorBoller, Th.
dc.creatorChartas, G.
dc.creatorComastri, A.
dc.date2005-09-06
dc.date.accessioned2026-07-07T11:24:44Z
dc.date.available2026-07-07T11:24:44Z
dc.descriptionWe present the results from XMM-Newton observations of the highly optically polarized broad absorption line quasar (BALQSO) CSO 755. By analyzing its X-ray spectrum with a total of ~3000 photons we find that this source has an X-ray continuum of `typical' radio-quiet quasars, with a photon index of Gamma=1.83^{+0.07}_{-0.06}, and a rather flat (X-ray bright) intrinsic optical-to-X-ray spectral slope of alpha_ox=-1.51. The source shows evidence for intrinsic absorption, and fitting the spectrum with a neutral-absorption model gives a column density of N_H~1.2x10^{22} cm^{-2}; this is among the lowest X-ray columns measured for BALQSOs. We do not detect, with high significance, any other absorption features in the X-ray spectrum. Upper limits we place on the rest-frame equivalent width of a neutral (ionized) Fe Ka line, <=180 eV (<=120 eV), and on the Compton-reflection component parameter, R<=0.2, suggest that most of the X-rays from the source are directly observed rather than being scattered or reflected; this is also supported by the relatively flat intrinsic alpha_ox we measure. The possibility that most of the X-ray flux is scattered due to the high level of UV-optical polarization is ruled out. Considering data for 46 BALQSOs from the literature, including CSO 755, we have found that the UV-optical continuum polarization level of BALQSOs is not correlated with any of their X-ray properties. A lack of significant short- and long-term X-ray flux variations in the source may be attributed to a large black-hole mass in CSO 755. We note that another luminous BALQSO, PG 2112+059, has both similar shallow C IV BALs and moderate X-ray absorption.
dc.description7 pages (emulateapj), 3 figures. Accepted by AJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0509146
dc.identifierhttp://arxiv.org/abs/astro-ph/0509146
dc.identifierAstron.J.130:2522-2528,2005
dc.identifierdoi:10.1086/497830
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195292
dc.subjectAstrophysics
dc.titleXMM-Newton Spectroscopy of the Highly Polarized and Luminous Broad Absorption Line Quasar CSO 755
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