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Conclusion

Using ergodicity hypothesis, we show that the old neutron star population in the Galaxy under reasonable suggestions about initial space and velocity distributions of young pulsars can fill a thorus-like region extended up to several tens kiloparsecs above the galactic plane. The general shape of this space distribution is mainly defined by the assumed galactic potential. The obtained distribution is undergone by the isotropy and homogeneity tests appropriate to gamma-bursts problem. At the chosen parameters, the distribution cannot simultaneously explain both the observed isotropy of gamma-burst locations on the sky, and low tex2html_wrap_inline157 . However, existence of two populations of gamma-burst progenitors distinctive by their space distributions will change the picture but cannot be calculated in a proper way at present. Future improvement of the gamma-burst statistics presumably will give answer to this problem.



Mike E. Prokhorov
Fri Jul 19 19:16:07 MSD 1996