Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..435c&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 435 - 436
Astronomy and Astrophysics
Astrophysics
Active Galactic Nuclei: X-Ray Spectra
Scientific paper
The authors present a detailed X-ray spectral analysis in the 0.1-2.4 keV ROSAT band of all EMSS AGN detected with more than 300 net counts in ROSAT/PSPC public (as of May 31, 1995) observations. The sample consists of 63 AGN. A Kolmogorov-Smirnov test on the redshift and luminosity distributions shows that this subsample is representative of the whole EMSS sample. A maximum-likelihood analysis is used to find the mean power-law spectral index <αp> and the intrinsic dispersion σp. The authors find <αp> = 1.42 with σp = 0.44. This value is significantly steeper (Δα ≍ 0.4) than the mean Einstein/IPC spectral index obtained applying the ML analysis on the whole sample of EMSS AGN. This result shows that the soft excess already noted for optically selected AGN is present also in X-ray selected AGN.
Ciliegi Paolo
Maccacaro Tomasso
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