Gamma-ray bursts in the Galactic halo

Details Gamma-ray bursts in the Galactic halo Gamma-ray bursts in the Galactic halo

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.355..522b&link_type=abstract

Nature (ISSN 0028-0836), vol. 355, Feb. 6, 1992, p. 522-524.

Astronomy and Astrophysics

Astronomy

50

Galactic Structure, Gamma Ray Bursts, Halos, Milky Way Galaxy, Neutron Stars, Astronomical Models, Brightness Distribution, Gamma Ray Observatory, Spaceborne Astronomy

Scientific paper

It is shown here that significant isotropy can be achieved for the angular and luminosity distributions of gamma-ray bursts with a spherically symmetric Galactic halo model for the bursts if the halo extends out beyond 100 kpc. Large halo core radii enhance isotropy, although consistency with observation is possible for core radii as small as 5 kpc if the halo radius is sufficiently large. The intrinsic luminosity distribution of gamma-ray bursts must be treated as a free parameter to fit the observations. If gamma-ray bursts are from the halo, they are likely to be old population H neutron stars, because models based on pulsars escaping from the Galactic plane have strong anisotropies.

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