X-rays from the Highly Polarized Broad Absorption Line QSO CSO 755
Abstract
We present results from a BeppoSAX observation of the BAL QSO CSO 755, 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 MECS, 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 only able to place 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 x 10-13 erg cm-2 s-1) is high enough to allow XMM spectroscopy, and studies of iron K line emission should prove of particular interest if a large amount of scattered X-ray flux is present.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.