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

Abstract

We 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.

arXiv comment7 pages (emulateapj), 3 figures. Accepted by AJ

References in corpus (33)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• The Sloan Digital Sky Survey: Technical Summary
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• Fluorescent iron lines as a probe of astrophysical black hole systems
• X-ray Spectra of a large sample of Quasars with ASCA
• On the Nature of Soft X-ray Weak Quasi-Stellar Objects
• The Sloan Digital Sky Survey Quasar Catalog III. Third Data Release
• Chandra Detects Relativistic Broad Absorption Lines from APM 08279+5255
• Soft X-ray and Ultraviolet Emission Relations in Optically Selected AGN Samples
• XMM-NEWTON Reveals the Quasar Outflow in PG 1115+080
• The Ionized Gas and Nuclear Environment in NGC 3783. IV. Variability and Modeling of the 900 ks CHANDRA Spectrum
• X-ray Spectroscopy of QSOs with Broad Ultraviolet Absorption Lines
• A Chandra Survey of Broad Absorption Line Quasars
• Polarization of Broad Absorption Line QSOs I. A Spectropolarimetric Atlas
• The relationship between X-ray variability amplitude and black hole mass in active galactic nuclei
• Broad Absorption Line QSOs Observed by the ROSAT PSPC
• Confirmation of the existence of coherent orientations of quasar polarization vectors on cosmological scales
• Exploratory ASCA Observations of Broad Absorption Line Quasi-Stellar Objects
• X-ray Lighthouses of the High-Redshift Universe. II. Further Snapshot Observations of the Most Luminous z>4 Quasars with Chandra
• Heavy X-ray Absorption in Soft X-ray Weak Active Galactic Nuclei
• Dynamical and Spectral Modeling of the Ionized Gas and Nuclear Environment in NGC 3783
• The X-ray Spectral Properties and Variability of Luminous High-Redshift Active Galactic Nuclei
• Dramatic X-ray Spectral Variability of the Broad Absorption Line Quasar PG2112+059
• Polarization properties of broad absorption line QSOs : new statistical clues
• Chandra Observations of the Cloverleaf Quasar H 1413+117: A Unique Laboratory for Microlensing Studies of a Lobal Quasar
• XMM-Newton (cross)-calibration
• XMM-Newton Observations of Two BAL QSOs: Q1246-057 and SBS1542+541
• Variation in the Scattering Shroud Surrounding Markarian 231
• Detection of an Iron Emission Feature from the Lensed BAL QSO H1413+117 at z=2.56
• X-rays from the Highly Polarized Broad Absorption Line QSO CSO 755
• In-orbit performance of the EPIC-MOS detectors on XMM-Newton
• XMM-Newton Observation of Fe Kalpha emission from a BAL QSO: Mrk 231
• Probing Broad Absorption Line Quasar Outflows: X-ray Insights

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