If our galaxy possesses a corona of neutron stars responsible for most or all currently observed gamma-ray bursts, then Andromeda (M31) should possess a similar corona. Bursts from the M31 corona are detectable by a sufficiently sensitive detector, and this places important constraints on Galactic corona models, in particular on the maximum distance out to which a detector like BATSE can see. We investigate the viability of coronal burst models by calculating the spatial distribution of bursts expected for a population of high-velocity neutron stars born in the disks of the Milky Way and Andromeda, and moving in a gravitational potential that includes the bulges, disks, and dark matter halos of both galaxies. We consider two burst emission scenarios, one in which the emission is isotropic and one in which it is beamed along the neutron star kick velocity. We constrain the models by comparing the resulting burst brightness and angular distributions with those of the BATSE 3B catalog. If bursts radiate isotropically, we find that the Galactic corona model can reproduce the BATSE data for kick velocities source turn-on ages and BATSE sampling distances If bursts are instead beamed, kick velocities and BATSE sampling distance are still required, but a characteristic burst turn-on age is not.
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1 August 1996
Gamma-ray bursts: 3rd Huntsville symposium
25-27 Oct 1995
Huntsville, Alabama (USA)
Research Article|
August 01 1996
Contraints on Galactic corona models of gamma-ray bursts imposed by Andromeda and the BATSE 3B catalog
Paolo Coppi;
Paolo Coppi
Department of Astronomy, Yale University, P.O. Box 208101, New Haven Connecticut 06520
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Tomasz Bulik;
Tomasz Bulik
Department of Astronomy and Astrophysics, University of Chicago 5640 South Ellis Avenue, Chicago, Illinois 60637
Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
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Donald Q. Lamb
Donald Q. Lamb
Department of Astronomy and Astrophysics, University of Chicago 5640 South Ellis Avenue, Chicago, Illinois 60637
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AIP Conf. Proc. 384, 358–362 (1996)
Citation
Paolo Coppi, Tomasz Bulik, Donald Q. Lamb; Contraints on Galactic corona models of gamma-ray bursts imposed by Andromeda and the BATSE 3B catalog . AIP Conf. Proc. 1 August 1996; 384 (1): 358–362. https://doi.org/10.1063/1.51561
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