Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.5202g&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #52.02; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
1
Scientific paper
AGN unification models spawned in the optical are now confronted with multiwavelength data that break the simplest Type I/II dichotomy. For instance, some broad emission line (optical Type I) AGN (BLAGN) are found to show significant X-ray absorption, and some narow line AGN (NLAGN) show none. Some of the absorbed BLAGN are explained as BALQSOs, but some are not. We cross-correlate the largest intermediate depth Chandra X-ray survey, the ChaMP, with a new SDSS photometric quasar catalog (extending to fainter mags and higher redshifts than the spectroscopic sample), and study the X-ray spectral properties of luminous broad line quasars. This constrains the absorbed fraction, identifies new BALQSO candidates, and tests claims of decreased absorption with increasing luminosity. We also contrast the X-ray spectral properties of this sample with those of an X-ray-selected BLAGN sample from the ChaMP.
Aldcroft Thomas L.
Barkhouse Wayne A.
ChaMP Collaboration
Green Paul J.
Kim Dongseok
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