2002ApJ...567...37G -
Astrophys. J., 567, 37-41 (2002/March-1)
X-ray spectroscopy of quasi-stellar objects with broad ultraviolet absorption lines.
GALLAGHER S.C., BRANDT W.N., CHARTAS G. and GARMIRE G.P.
Abstract (from CDS):
For the population of quasi-stellar objects (QSOs) with broad ultraviolet absorption lines, we are just beginning to accumulate X-ray observations with enough counts for spectral analysis at CCD resolution. From a sample of eight QSOs (including four broad absorption line [BAL] QSOs and three mini-BAL QSOs) with ASCA or Chandra spectra with more than 200 counts, general patterns are emerging. Their power-law X-ray continua are typical of normal QSOs with Γ~2.0, and the signatures of a significant column density [NH~(0.1-4)x1023 cm–2] of intrinsic, absorbing gas are clear. Correcting the X-ray spectra for intrinsic absorption recovers a normal ultraviolet-to-X-ray flux ratio, indicating that the spectral energy distributions of this population are not inherently anomalous. In addition, a large fraction of our sample shows significant evidence for complexity in the absorption. The subset of BAL QSOs with broad Mg II absorption apparently suffers from Compton-thick absorption completely obscuring the direct continuum in the 2-10 keV X-ray band, complicating any measurement of their intrinsic X-ray spectral shapes.
Abstract Copyright:
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Journal keyword(s):
Galaxies: Active - Galaxies: Quasars: Absorption Lines - X-Rays: Galaxies
Simbad objects:
9
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