Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238p..45v&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, June 1, 1989, p. 45P-48P. Research supported by th
Astronomy and Astrophysics
Astronomy
10
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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