Lifting the Shroud around Broad Absorption Line Qsos: AN AXAF Survey

Details Lifting the Shroud around Broad Absorption Line Qsos: AN AXAF Survey Lifting the Shroud around Broad Absorption Line Qsos: AN AXAF Survey

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop...45g&link_type=abstract

Chandra Proposal ID #01700369

Physics

Chandra Proposal Id #01700369

Scientific paper

We propose a short-exposure AXAF survey of a sample of 16 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 or possibly all 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. The latter alternative means that BALQSOs are an intrinsically different type of quasar. We propose to settle this question finally, with a judicious application of AXAF's unique capabilities.

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