Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911102p&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #111.02; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a remarkable population of z 2 obscured and extremely luminous QSOs. The sample was selected in the largest Spitzer surveys (SWIRE & NDWFS) by means of their extremely red infrared colors and bright mid-infrared fluxes. Follow-up observations with the IRS provide spectroscopic redshifts and constrain their mid-infrared luminosities. The sample includes the most luminous 15 obscured QSOs currently known. Their SEDs are modeled using a clumpy dust torus and their infrared absorption is estimated for both the continuum emission and the Silicate absorption feature at 9.7 micron. For a sub-sample of five sources for which X-ray data are available, the dust covering factor is estimated and dust extinction is compared with X-ray absorption. The properties of these luminous QSOs are discussed in the context of AGN evolutionary scenarios and absorber models.
Hoenig Sebastian
Houck John
Lonsdale Carol
Polletta Mari
Smith Hal
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