Precursor active galaxies and the cosmic X-ray background

Details Precursor active galaxies and the cosmic X-ray background Precursor active galaxies and the cosmic X-ray background

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.290..483b&link_type=abstract

Nature, vol. 290, Apr. 9, 1981, p. 483-485.

Astronomy and Astrophysics

Astronomy

8

Active Galaxies, Background Radiation, Black Holes (Astronomy), Cosmic X Rays, Extraterrestrial Radiation, Galactic Radiation, Galactic Evolution, Gamma Rays, Heao 1, Heao 2, Spectrum Analysis, Thermal Radiation, X Ray Spectra

Scientific paper

Consideration is given to Carr's theory (1980) that most cosmic X-ray background is produced by thermal X-ray emission associated with black hole accretion disks for compact objects. It is posited that the onset of significant X-rays occurs during galaxy formation when accretion disks are formed by the interaction of young galaxies and massive black holes of pregalactic origin. The study suggests that most cosmic X-ray background could be produced from distant sources with a low ratio of optical to X-ray luminosity. Precursor active galaxy objects involving a massive black hole surrounded by a hot optically thin accretion disk radiating near the Eddington luminosity limit and with an effective temperature of about 2 x 10 to the 9th K would fulfill the condition and produce the correct background spectrum and intensity. This model also associates cosmic X-ray background and nonthermal gamma-ray background to active galaxies, thus implying that massive black holes are associated with their internal dynamics.

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