γ-ray Bursts and the Diffuse Flux of Cosmic X-rays

Details γ-ray Bursts and the Diffuse Flux of Cosmic X-rays γ-ray Bursts and the Diffuse Flux of Cosmic X-rays

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.245..201h&link_type=abstract

Nature, Volume 245, Issue 5422, pp. 201-202 (1973).

Physics

2

Scientific paper

MANY attempts have been made to explain the diffuse cosmic X-ray flux in terms of contributions from a large number of discrete extragalactic sources. The nature of these sources has remained obscure; the steady emission from normal galaxies, such as our own, fails by more than an order of magnitude to explain the intensity of the diffuse flux1. The spectrum of the diffuse flux can be approximated to a power law (ɛ in keV) for values of ɛ from 1 keV to 1 MeV. This poses a further problem because the spectrum is much harder than that of the discrete extragalactic sources which have been detected. Klebesadel et al.2 have recently reported observations of bursts of radiation with hard spectra which extend to photon energies greater than 1 MeV. Here I shall show that, whatever is the nature of the sources of these bursts, they are unlikely to make a significant contribution to the diffuse flux.

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