Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267..490h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 267, p. 490
Astronomy and Astrophysics
Astronomy
31
Gamma Ray Spectra, Pulsars, Gamma Ray Astronomy, X Ray Astronomy, Stellar Evolution, Cos-B Satellite, Point Sources
Scientific paper
The distance to the high-energy gamma-ray source Geminga is discussed in terms of recent optical, UV, EUV and X-ray observations, and its potential birthplaces are reviewed. The distance limits derived place constraints on the pulsar beaming factor, f(gamma), and its efficiency of turning rotational kinetic energy into gamma-rays, eta. Using similar constraints on four other rotation-powered neutron stars derived from COS-B and EGRET data and the fact that 553 other known radio pulsars were not detected in the COS-B survey, I define a region of the f(gamma)-eta plane which is consistent with the observations, and which provides a method for determining the number of additional pulsars we can expect to find in the EGRET survey. A consideration of the unidentified COS-B point sources agrees with previous work suggesting that they too are rotation-powered neutron stars. Independent of their identity, however, their numbers provide additional constraints on eta, f(gamma), and the gamma-ray pulsar population of the Galaxy.
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