Population properties of AGN in the soft X-ray band

Details Population properties of AGN in the soft X-ray band Population properties of AGN in the soft X-ray band

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..719w&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 719-726 (SEE N90-258

Astronomy and Astrophysics

Astronomy

15

Active Galactic Nuclei, Star Distribution, X Ray Sources, X Ray Spectra, Background Radiation, Bl Lacertae Objects, Cosmic Rays, Galactic Radiation, Luminosity, Maximum Likelihood Estimates, Quasars, Spectral Signatures

Scientific paper

Maximum likehood analysis can be used to separate the intrinsic dispersion of spectral index from the measuring errors for X-ray observed samples of active galactic nuclei (AGN). A finite sigma tends to introduce selection biases, compels the use of large samples in searches for intrinsic properties, and can mask quite substantial trends in X-ray spectral index with other source properties. The property which appears to affect the mean spectral index is the relative strength of radio emission. The connection between radio and X-ray luminosity is discussed. Observed trends to flatter AGN X-ray spectral components with higher energy may be important in evaluating the composite spectrum of AGN contributing to the cosmic X-ray background.

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