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 withfaint near-IR and optical counterparts. They could be the tip of the iceberg ofa population of heavily obscured AGN which may carry a large fraction ofaccretion and of the SMBH mass density at z>2. The proposed observations arecrucial to evaluate the fraction of the mid-infrared selected type 2 QSOs whichwould have been selected also by X-ray surveys, and to assess whether the mid-IRselection is truly more efficient in discovering the long sougth population ofhigh-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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The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr Fabrizio Fiore, 2008, 'The dark side of accretion: chasing type 2 QSOs', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-93sefud
