Lifting the Shroud Around Broad Absorption Line QSOs: A Chandra Survey

Details Lifting the Shroud Around Broad Absorption Line QSOs: A Chandra Survey Lifting the Shroud Around Broad Absorption Line QSOs: A Chandra Survey

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.0204a&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #02.04; Bulletin of the American Astronomical Society, Vol. 32, p.1182

Astronomy and Astrophysics

Astronomy

Scientific paper

We have carried out a short-exposure Chandra survey of a sample of 10 bright Broad Absorption Line (BAL) QSOs. BALs are caused by outflows from the nucleus with velocities reaching 0.2c. Recent ROSAT studies imply that the soft X-ray continuum of BALQSOs is either a) strongly absorbed by highly ionized material, or b) intrinsically underluminous. Since about 10% of QSOs show BALs, the former interpretation supports the hypothesis that most QSOs contain BAL-type outflows, with a 10% covering factor. BALQSOs may thus provide a unique probe of cloud conditions near the nucleus of most QSOs. Our snapshot survey consists of 10 observations ranging in length from 1.0 to 5.5 ksec, depending on the predicted X-ray source brightness. The total observation time is 36 ksec. Eight out of ten sources are detected, with observed counts ranging from ~10 to ~ 100 each. For the detected quasars, the observed optical to X-ray spectral slope (α ox from 4400 Å to 2 keV) varies from 2 to 2.5, with an average value of 2.3. In this paper we present details of these observations, analysis of the composite X-ray spectrum from the survey, and the implications of our data on the true nature of BALQSOs. This work was supported by NASA grant NAS8-39073.

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