Galactic dual population models of gamma-ray bursts

Details Galactic dual population models of gamma-ray bursts Galactic dual population models of gamma-ray bursts

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434..552h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 434, no. 2, p. 552-556

Astronomy and Astrophysics

Astronomy

14

Astronomical Models, Galactic Halos, Galactic Structure, Gamma Ray Astronomy, Gamma Ray Bursts, Milky Way Galaxy, Andromeda Galaxy, Gamma Ray Observatory, Neutron Stars, Satellite-Borne Instruments, Statistical Analysis

Scientific paper

We investigate in more detail the properties of two-population models for gamma-ray bursts in the galactic disk and halo. We calculate the gamma-ray burst statistical properties, mean value of (V/Vmax), mean value of cos Theta, and mean value of (sin2 b), as functions of the detection flux threshold for bursts coming from both Galactic disk and massive halo populations. We consider halo models inferred from the observational constraints on the large-scale Galactic structure and we compare the expected values of mean value of (V/Vmax), mean value of cos Theta, and mean value of (sin2 b), with those measured by Burst and Transient Source Experiment (BATSE) and other detectors. We find that the measured values are consistent with solely Galactic populations having a range of halo distributions, mixed with local disk distributions, which can account for as much as approximately 25% of the observed BATSE bursts. M31 does not contribute to these modeled bursts. We also demonstrate, contrary to recent arguments, that the size-frequency distributions of dual population models are quite consistent with the BATSE observations.

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