Hard power-law emission components in the X-ray spectra of elliptical galaxies

Details Hard power-law emission components in the X-ray spectra of elliptical galaxies Hard power-law emission components in the X-ray spectra of elliptical galaxies

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.1307d&link_type=abstract

American Astronomical Society, HEAD meeting #4, #13.07; Bulletin of the American Astronomical Society, Vol. 31, p.711

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the first detections of hard power-law emission components in the X-ray spectra of six giant elliptical galaxies with previously-reported evidence for supermassive black holes in their nuclei. The observations were carried out with the ASCA satellite.The mean photon index, Gamma =1.2, and luminosities of the detected power-law components (L_{X,1-10} ~ 2.6 x 10(40) -2.1 x 10(42) ergs(-1) ) suggest that the emission originates in the accretion process around the central black holes and is most plausibly due to low-radiative efficiency accretion. Detailed models and important implications of this discovery are discussed.

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