Gamma-ray burst annihilation lines and neutron star structure

Astronomy and Astrophysics – Astrophysics

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Annihilation Reactions, Gamma Ray Bursts, Line Spectra, Neutron Stars, Red Shift, Stellar Structure, Equations Of State, Gravitational Waves, Stellar Models

Scientific paper

The neutron star redshift data base provided by the recent measurements of gamma-ray burst pair annihilation lines in the range 300-511 keV is considered. Despite the controversies surrounding their reality and interpretations, it is shown that there is tentative evidence to support a neutron star redshift range of 0.2-0.5, with the highest concentration in the narrow range 0.25-0.35. Combined with mass data from X-ray and binary pulsars, these data favor the softer equation of state neutron star models, in particular equations of state A, D, E, F of the Arnett-Bowers (1977) catalog. This, in turn, constrains the quadrupole vibration frequency of neutron stars to the narrow range 2.2-2.9 kHz and the gravitational radiation damping time to 0.1-0.25 s. Prospects of detecting gravitational waves from events like that of March 5, 1979 are also discussed.

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