Supersoft X-ray Quasars

Details Supersoft X-ray Quasars Supersoft X-ray Quasars

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2608p&link_type=abstract

American Astronomical Society, HEAD meeting #10, #26.08

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new class of luminous quasars with very soft X-ray spectra (power-law photon indices > 3) and MV < -23; which we call "supersoft X-ray quasars" or SXQs. Two hundred of these sources were discovered by Becker (1998) while searching for new supersoft sources associated with nuclear-burning white dwarfs. Thirteen of the 200 SXQs have been observed serendipitously by Chandra or XMM-Newton. The softest one of these, RX J0139.2 at a redshift of z = 1.82, is well fit by a thermal spectrum from a relativistic disk around a black hole (the kerrbb model) without the usual strong power-law component, which may indicate a "naked" accretion disk. From this spectral model, we constrain the mass and spin of the black hole.

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