Active galactic nuclei make the cosmic X-ray background

Details Active galactic nuclei make the cosmic X-ray background Active galactic nuclei make the cosmic X-ray background

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l..81z&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 2, p. L81-L84.

Astronomy and Astrophysics

Astrophysics

25

Active Galactic Nuclei, Cosmic X Rays, Relic Radiation, Astronomical Spectroscopy, Quasars, Red Shift, Seyfert Galaxies, X Ray Spectra

Scientific paper

While it has long been known that active galactic nuclei (AGNs) make up a significant part of the X-ray background near 1 keV, it has been generally thought that the typical AGN X-ray spectrum did not fit the higher energy background spectrum. More recent data (from Ginga, SIGMA, and OSSE) show that the X-ray spectra of radio-quiet AGNs do in fact resemble the X-ray background spectrum. These data are well described (from 2 to 100 keV) by a model in which the X-ray photons are made by thermal Comptonization, and a fraction (around a half) of the X-rays are reflected by a cool surface. Using the observed evolution of X-ray-bright AGNs, we show that the known AGN population, radiating the spectrum observed at low redshift and integrated in redshift back to z about 4, is capable of producing the entire X-ray background from 2 to 100 keV.

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