Contributions of low-luminosity sources to the X-ray background

Details Contributions of low-luminosity sources to the X-ray background Contributions of low-luminosity sources to the X-ray background

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..125p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. 125-134. Research supported by MPI and CNR.

Mathematics

Logic

36

Active Galactic Nuclei, Background Radiation, Cosmic X Rays, Seyfert Galaxies, Dwarf Galaxies, Heao 1, Interacting Galaxies, Luminosity, Quasars, Star Formation, Starburst Galaxies

Scientific paper

HEAO 1 A-2 data are used to determine hard X-ray fluxes, or upper limits, for complete optically selected samples of active and normal galaxies, in order to estimate or to constrain their local X-ray luminosity functions. It is found that the luminosity function of Seyfert nuclei must flatten down drastically shortly below the observational limit of Piccinotti et al (1982); little can be added by dwarf active nuclei hidden in otherwise normal galaxies. Also analyzed is the possible contribution to the X-ray background from galaxies with strong star-formation activity, in the light of the possibility of a substantial cosmological evolution suggested by recent radio and IRAS data.

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