Discrete X-ray Sources and the Diffuse X-ray Background

Details Discrete X-ray Sources and the Diffuse X-ray Background Discrete X-ray Sources and the Diffuse X-ray Background

Jan 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.221..347s&link_type=abstract

Nature, Volume 221, Issue 5178, pp. 347-348 (1969).

Physics

8

Scientific paper

IT has recently been suggested that the isotropic X-ray background can be accounted for by means of the superposed contributions from extra-galactic X-ray sources, provided that evolutionary effects are taken into account1,2. The neglect of evolutionary factors leads to a diffuse X-ray flux from discrete extra-galactic sources which falls short of the observed flux by between one and two orders of magnitude3. This appears to be true whether one considers normal galaxies (P~1040 ergs/s), radio galaxies (for M 87, P~1043 ergs/s), or quasi-stellar sources (for 3C 273, P<~1046 ergs/s). Here P is the flux in X-rays above 1 keV, and the estimates of P are justified later.

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