Reconciling UV and X-Ray Observations of BALQSO Winds

Details Reconciling UV and X-Ray Observations of BALQSO Winds Reconciling UV and X-Ray Observations of BALQSO Winds

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop...68h&link_type=abstract

Chandra Proposal ID #01700484

Physics

Chandra Proposal Id #01700484

Scientific paper

Recent X-ray observations of BALQSOs indicate absorbing columns that are 2 or more orders of magnitude larger than previous estimates from the UV absorption lines. This huge discrepancy must be resolved if we are to understand even the most basic properties of BAL winds (eg. their mass, location, acceleration, ionization, etc.). I recently used high-quality HST spectra of the bright (V = 15.8), low redshift (z_abs = 0.87) BALQSO PG 1254+047 to derive much larger column densities from the BALs, invoking new evidence that the lines are more optically thick than they appear. I now propose AXAF/ACIS-S observations to 1) test my BAL analysis and 2) place unprecedented constraints on the wind parameters and on the relationship between the UV and X-ray absorbers.

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