An Absorption Study of PG 2112+059: the X-Ray brightest BAL QSO Known

Details An Absorption Study of PG 2112+059: the X-Ray brightest BAL QSO Known An Absorption Study of PG 2112+059: the X-Ray brightest BAL QSO Known

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9277g&link_type=abstract

HST Proposal ID #9277

Computer Science

Hst Proposal Id #9277

Scientific paper

Broad Absorption Line {BAL} QSOs allow us to observe substantial gas outflows that are probably present in most QSOs, but the nature of their X-ray absorption remains poorly understood. In an ASCA/BeppoSAX survey of BAL QSOs, we have recently discovered that PG 2112+059 is the X-ray brightest BAL QSO known and shows X-ray absorption suggestive of ionized gas. Furthermore, X-ray spectral variability is apparent by comparison of ASCA and ROSAT data. We propose a 60 ks ACIS-S observation of PG 2112+059 that will provide the best constraints yet on the column density, ionization state, covering fraction, and outflow velocity of the X-ray gas in a BAL QSO. We will also obtain a simultaneous HST STIS spectrum to test UV/X-ray absorber models and monitor UV variability.

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