Gamma-ray emission from the reignited magnetospheres of dead pulsars - A possible source of gamma-ray bursts

Details Gamma-ray emission from the reignited magnetospheres of dead pulsars - A possible source of gamma-ray bursts Gamma-ray emission from the reignited magnetospheres of dead pulsars - A possible source of gamma-ray bursts

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262.1037c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 4, p. 1037-1046.

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Gamma Ray Bursts, Gamma Ray Spectra, Neutron Stars, Pulsar Magnetospheres, Computational Astrophysics, Satellite Observation

Scientific paper

We adopt the scenario of radio pulsar evolution proposed by Ruderman and his coworkers (1988, 1992), in which pulsars evolving in different phases radiate characteristic gamma-ray spectra. The neutron star spins down until the outer magnetosphere e(+/-) pair production and current flow are quenched and the magnetic dipole radiation torque aligns the dipole with the spin axis. Such aligned dead pulsars can be reignited by transient thermal X-ray emission from the stellar surface; thermal energy released, say, during glitches. The resultant gamma-ray spectra are used to fit several observed hard gamma-ray burst spectra, and provide a consistent fit. The amount of e(+/-)-pairs produced during the process is calculated, and is large enough to cause the annihilation-line features observed in some of the bursts. It is concluded that reignition of nearby dead pulsars is one of the possible sources of gamma-ray bursts. Thus some of these gamma-ray bursts must originate from galactic neutron stars.

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