Luminous Supersoft X-ray Quasars

Details Luminous Supersoft X-ray Quasars Luminous Supersoft X-ray Quasars

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop..105p&link_type=abstract

XMM-Newton Proposal ID #05535614

Computer Science

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, 0139.2-5430, 2245.3-4652, 0007.9+0528, 0923.1+4530, 0119.5-2821, 2359.5-2558, 1441.2+3450, 0947.0+4721, 0044.0+0133, 1319.1+3108, 2139.3-4235, 0953.5+3917, 1418.3+0637, 1106.0+6400, Xmm-Newton Proposal Id #05535614

Scientific paper

We will make short observations of 18 sources in a newly identified class of objects we call "supersoft X-ray quasars" (SXQs). These are high-luminosity quasars (Lx ~4x10^44 - 10^46 erg/s) with extremely soft (i.e., steep) spectra that were discovered during the ROSAT All-Sky Survey. The proposed XMM observations will more than double the number of such objects for which spectra are available. In addition, we will observe for 40 ks one SXQ with a power-law spectral index of ~7. Our objectives are (i) to characterize the spectra of SXQs over the full range of 0.2-10 keV, and (ii) to measure a multicomponent thermal disk spectrum. The latter will provide a direct handle on the black hole mass and spin.

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