Gamma-ray bursts and decay of neutron star magnetic fields

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma Ray Bursts, Neutron Stars, Stellar Magnetic Fields, Cyclotron Radiation, Spatial Distribution, X Ray Spectra

Scientific paper

The presence of cyclotron lines in the hard X-ray spectra of about 20 percent of gamma-ray bursts strongly supports the idea that at least some of these transient events originate from neutron stars with strong magnetic fields. The absence of a clear concentration of the gamma-ray bursts toward the galactic plane suggests that the neutron stars which produce the gamma-ray bursts are older than the average radio pulsar (whose sky distribution does show such a concentration), and this could indicate that the magnetic fields of neutron stars do not decay. It is shown that the properties of the observed population of gamma-ray burst sources are consistent with the idea that: (1) the magnetic fields of single neutron stars decay on a time-scale of about 10 to the 7th yr; and (2) all gamma-ray bursts originate from neutron stars with magnetic fields in excess of a few 10 to the 11th G; they could, therefore, be rather young objects.

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