Contributions of discrete sources to the X ray background

Details Contributions of discrete sources to the X ray background Contributions of discrete sources to the X ray background

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..737d&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 737-742 (SEE N90-258

Astronomy and Astrophysics

Astronomy

3

Active Galactic Nuclei, Background Radiation, Starburst Galaxies, X Ray Sources, X Ray Spectra, Black Holes (Astronomy), Heao 1, Interstellar Radiation, Star Formation, Stellar Mass Accretion

Scientific paper

A new analysis of the HEAO 1 A2 data base yielded strong constraints on the local luminosity function of extragalactic X-ray sources. Sources associated with galaxies cannot make up the entire X-Ray Background (XRB) without evolution. The available information on X-ray properties of actively star forming galaxies suggests a contribution at 2 keV lower than 10 percent; a contribution equal or greater than 30 percent implies that these objects comprise an uncomfortably large fraction of medium sensitivity survey and deep survey sources. General constraints on models, assuming that the XRB energy budget comes from nuclear reactions in stars or from accretion into massive black holes, are discussed.

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