Chandra X-Ray Observations of Radio-Loud Broad Absorption Line Quasars

Details Chandra X-Ray Observations of Radio-Loud Broad Absorption Line Quasars Chandra X-Ray Observations of Radio-Loud Broad Absorption Line Quasars

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aj....130.2006b&link_type=abstract

The Astronomical Journal, Volume 130, Issue 5, pp. 2006-2011.

Astronomy and Astrophysics

Astronomy

15

Galaxies: Quasars: Absorption Lines, Galaxies: Quasars: General, X-Rays: Galaxies

Scientific paper

We report the results of a Chandra X-Ray Observatory survey of five formally radio-loud broad absorption line (BAL) quasars. These five objects include BAL quasars with a range of properties, including both high- and low-ionization BALs. All five BAL quasars are detected in 5 ks ACIS-S exposures, with counts ranging from 12 to 55. The X-ray count rates are down by factors of 40 or more compared to expectations based on the spectral energy distributions of normal, unabsorbed radio-loud quasars; this is the same sort of behavior seen in radio-quiet BAL quasars. Interestingly, the hardness ratios are rather soft and inconsistent with absorption from a neutral hydrogen column density large enough to suppress the X-rays as observed. We conclude that in many cases the X-rays emanating from BAL quasars must be reflected, scattered, or leaked through an ionized absorber or a neutral absorber that does not completely cover the X-ray source (covering >=98%), or that we are seeing an unabsorbed X-ray source perhaps associated with a radio jet. Much higher counts are required to distinguish among these possibilities. We note several suggestive correlations involving X-ray properties that require verification using larger samples. One source, FIRST J1556+3517, appears to be the X-ray brightest low-ionization BAL quasar known, other than the special case of the nearby Mrk 231. The very faint X-ray emission from FIRST J1044+3656 is consistent with significant obscuration, which strongly favors the multiphase X-ray shielding models of this object in the literature.

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