The soft X-ray excesses of high-luminosity AGN

Details The soft X-ray excesses of high-luminosity AGN The soft X-ray excesses of high-luminosity AGN

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262...63s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 1, p. 63-74.

Astronomy and Astrophysics

Astronomy

39

Active Galactic Nuclei, Bremsstrahlung, Luminosity, Quasars, Stellar Spectra, X Ray Astronomy, Cool Stars, Exosat Satellite, Ginga Satellite, Variability

Scientific paper

Ginga power-law indices of a sample of 12 quasars combined with the EXOSAT ME data are used to obtain more precise measurements of the soft excess observed in low-energy telescopes. Eight quasars exhibit a significant soft excess and the remaining four have upper limits consistent with ubiquity of a soft excess in the present sample. Variability of the soft excess is established for three quasars with time-scales consistent with the inner region of an accretion disk around a 10 exp 8 solar mass black hole. The luminosity of the soft excess correlates well with other wavebands above M(B) = -23, but for the most luminous objects the soft excess appears to saturate. It is argued that, compared to lower luminosity AGN, the most luminous quasars have an accretion disk which is cooler in its inner regions due to a black hole of larger mass.

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