Understanding the CXB: Measuring the Compton-thick AGN fraction at high redshift

Details Understanding the CXB: Measuring the Compton-thick AGN fraction at high redshift Understanding the CXB: Measuring the Compton-thick AGN fraction at high redshift

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop...30s&link_type=abstract

XMM-Newton Proposal ID #04007406

Computer Science

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, 3C22, 3C34, 3C41, 3C226, 3C340, Xmm-Newton Proposal 04007406

Scientific paper

The 30-keV peak of the Cosmic X-ray Background (CXB) and its hard spectrum at 2--10keV imply a large population of luminous heavily absorbed AGN ("Type 2 QSOs"). However, X-ray surveys have been remarkably unsuccessful in shedding light on this population, as ultra-deep surveys have located intrinsically faint sources at low redshift which cannot contribute substantially to the CXB, rather than a population of nearly Compton-thick objects. In this proposal, we aim to tackle the problem in the reverse direction, by starting with a known population of Type 2 QSOs (radio galaxies) and measuring their X-ray properties, most importantly the photoelectric absorption columns. This will answer for the first time the question of how many AGN are (nearly) Compton-thick.

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