X-ray selected Type-2 QSOs -- Their Mid-Infrared Properties and Physical Nature

Details X-ray selected Type-2 QSOs -- Their Mid-Infrared Properties and Physical Nature X-ray selected Type-2 QSOs -- Their Mid-Infrared Properties and Physical Nature

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3223s&link_type=abstract

Spitzer Proposal ID #3223

Computer Science

Scientific paper

Our recent XMM-Newton observations have revealed the presence of a population of intrinsically luminous but highly obscured AGN, the long sought after Type-2 QSOs. Such sources were proposed to be a crucial component of AGN unification theories and of models for the extragalactic X-ray and infrared background. Here we propose low-resolution IRS spectroscopy of 8 of these type 2 QSOs, selected mostly from our deep XMM-Newton observations of the Lockman Hole. The IRS low resolution spectra will represent the first mid-infrared spectra ever taken of such objects. In combination with our corresponding X-ray data, the spectra will allow us to study the nature of these objects and of their host galaxies. We will determine (i) the relative contributions of star formation and AGNs to their energy output, (ii) the fraction of their contribution to the cosmic infrared-background that is due to accretion, and (iii) the relation of re-processed mid-infrared AGN continuum and intrinsic X-ray emission. By comparing this mid-IR/X-ray ratio to lower luminosity AGNs, we will iv) probe the role of variations in the covering factor for the luminosity dependence of the type-2/type-1 ratio of AGNs.

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