The dark side of accretion: chasing type 2 QSOs

Details The dark side of accretion: chasing type 2 QSOs The dark side of accretion: chasing type 2 QSOs

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..230f&link_type=abstract

XMM-Newton Proposal ID #04064203

Computer Science

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Ams13, Ams5, Ams14_16_17, Xmm-Newton Proposal 04064203

Scientific paper

We propose to detect the X-ray emission of a sample of five extreme QSOs, selected to be bright at mid-IR Spitzer and Radio (VLA) waveleghts but with faint near-IR and optical counterparts. They could be the tip of the iceberg of a population of heavily obscured AGN which may carry a large fraction of accretion and of the SMBH mass density at z>2. The proposed observations are crucial to evaluate the fraction of the mid-infrared selected type 2 QSOs which would have been selected also by X-ray surveys, and to assess whether the mid-IR selection is truly more efficient in discovering the long sougth population of high-z Compton thick AGN postulated in all AGN synthesis models for the CXB, with obvious important consequences for the estimates of the SMBH mass density.

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