Properties of X-ray selected Broad Absorption Line Quasars

Abstract

Broad 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.

arXiv comment13 pages, 8 figures, accepted for publication in MNRAS

References in corpus (44)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• Local Supermassive Black Holes, Relics of Active Galactic Nuclei and the X-ray Background
• NYU-VAGC: a galaxy catalog based on new public surveys
• Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
• Subaru Prime Focus Camera -- Suprime-Cam --
• The Chandra Deep Field South: the 1 Million Second
• The Chandra Deep Field South: Optical Spectroscopy I
• An X-ray spectral study of 24 type-1 AGN
• A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Third Data Release
• The nature and origin of Seyfert warm absorbers
• Intrinsic Absorption Lines in Seyfert 1 Galaxies. I. Ultraviolet Spectra from the Hubble Space Telescope
• GaBoDS: The Garching-Bonn Deep Survey; IV. Methods for the Image reduction of multi-chip Cameras
• Chandra Detects Relativistic Broad Absorption Lines from APM 08279+5255
• The Multiwavelength Survey by Yale-Chile (MUSYC): Survey Design and Deep Public UBVRIz' Images and Catalogs of the Extended Hubble Deep Field South
• X-ray emission from radio-quiet quasars in the SDSS Early Data Release. The alpha_ox dependence upon UV luminosity
• The Ionized Gas and Nuclear Environment in NGC 3783. IV. Variability and Modeling of the 900 ks CHANDRA Spectrum
• The Intrinsic Fraction of Broad Absorption Line Quasars
• An Exploratory Chandra Survey of a Well-Defined Sample of 35 Large Bright Quasar Survey Broad Absorption Line Quasars
• A Chandra Survey of Broad Absorption Line Quasars
• Outflows and the Physical Properties of Quasars
• A Kinematic Model for the Narrow-Line Region in NGC 4151
• Absorption Measure Distribution of the Outflow in IRAS 13349+2438: Direct Observation of Thermal Instability?
• GaBoDS: The Garching-Bonn Deep Survey V. Data release of the ESO Deep-Public-Survey
• 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
• A Relation Between Supermassive Black Hole Mass and Quasar Metallicity?
• The mass-energy budget of the ionised outflow in NGC 7469
• Dramatic X-ray Spectral Variability of the Broad Absorption Line Quasar PG2112+059
• The origin of the Fe K features in Markarian 205 and Markarian 509
• Variable UV Absorption in the Seyfert 1.5 Galaxy NGC 3516: The Case for Associated UV and X-ray Absorption
• Eddington Accretion and QSO Emission Lines at z ~ 2
• The distribution of absorption in AGN detected in the XMM-Newton observations of the CDFS
• The Ionized Gas and Nuclear Environment in NGC 3783 III. Detection of a Decreasing Radial Velocity in an Intrinsic UV Absorber
• XMM-Newton and Chandra Spectroscopy of the Variable High-Energy Absorption of PG 1115+080: Refined Outflow Constraints
• XMM-Newton Observations of Two BAL QSOs: Q1246-057 and SBS1542+541
• X-ray spectra of sources in the 13H XMM-Newton / Chandra deep field
• The Kinematics and Physical Conditions pf the Ionized Gas in Markarian 509. II. STIS Echelle Observations
• XMM-Newton 13H Deep field - I. X-ray sources
• A medium deep Chandra and Subaru survey of the 13hr XMM/ROSAT deep survey area
• X-ray Absorption in Type II Quasars: Implications for the Equatorial Paradigm of Broad Absorption Line Quasars
• A long look at the BALQSO LBQS 2212-1759 with XMM-Newton
• The XMM-Newton Survey Science Centre Medium Sensitivity Survey

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