Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..555e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 15, 1985, p. 555-563. DOE-sponsored research.
Astronomy and Astrophysics
Astrophysics
30
Brightness Temperature, Gamma Ray Bursts, Neutron Stars, Satellite Observation, Stellar Structure, Eddington Approximation, Heao 1, Optical Thickness, Pair Production, Solar Maximum Mission, Space Density
Scientific paper
Upper limits to the distances and intensities are presented for several well-observed gamma-ray burst sources. It is assumed that the gamma-ray emission comes from near the surfaces of neutron stars and that it is not collimated. The distortion of the gamma-ray spectrum due to photon-photon pair production is derived. It is found that the maximum distance to which the burst sources could be seen for a given sensitivity limit varies little from source to source. The minimum space density of active gamma ray burst sources is about 10 to the -6th/cu pc if the emission is from the entire surface of the neutron star and about 1000 times greater if the emission is from a small cap or thin strip-shaped region. The brightness temperatures for the bursts are far below kinetic temperatures of the radiating particles.
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