Abstract
We present results from a BeppoSAX observation of the broad absorption line (BAL) QSO CSO 755, which was observed as part of our program to investigate the X-ray properties of highly polarized BAL QSOs. CSO 755 is clearly detected by the BeppoSAX Medium-Energy Concentrator Spectrometers, making it the highest redshift (z = 2.88) and most optically luminous (Mv = -27.4) BAL QSO seen in X-rays. It is detected in several energy bands including the rest-frame 21-39 keV band, but we are able to place only loose constraints upon its X-ray spectral shape. Our X-ray detection is consistent with the hypothesis that the BAL QSOs with high optical continuum polarization tend to be the X-ray brighter members of the class. We examine a scattering interpretation of a polarization/X-ray flux connection, and we discuss the data needed to prove or refute such a connection. We also discuss a probable ROSAT detection of CSO 755. The observed-frame 2-10 keV flux from BeppoSAX (1.3 × 10-13 ergs cm-2 s-1) is high enough to allow X-Ray Multimirror Mission spectroscopy, and studies of iron K-line emission should prove of particular interest if a large amount of scattered X-ray flux is present.
Original language | English (US) |
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Pages (from-to) | L69-L72 |
Journal | Astrophysical Journal |
Volume | 525 |
Issue number | 2 PART 2 |
DOIs | |
State | Published - Nov 10 1999 |
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science