Pulsed gamma-ray emission from neutron and collapsing stars and supernovae

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma Rays, Gravitational Collapse, Neutron Stars, Pulsed Radiation, Stellar Radiation, Supernovae, Neutrinos, Stellar Evolution, Thermal Emission, X Ray Astronomy

Scientific paper

Mechanisms are analyzed which may generate pulsed gamma-ray emissions during late stages of stellar evolution, including absorption of neutrino emission in a stellar envelope during gravitational collapse, thermal emission in the outer layers of a compact star caused by the shock from a supernova explosion, and ejection of matter from a neutron star at an active stage in its existence. The magnitude of gamma bursts resulting from each of these mechanisms is estimated, and only the last two cases are found to produce energies which are in agreement with observations. It is noted that ejection of matter from neutron stars may be related to the observed jumps in pulsar periods, and it is suggested that this mechanism may be the most likely one for interpreting observations of pulsed gamma-ray emissions.

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