Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-16
Astronomy and Astrophysics
Astrophysics
10 pages, 2 figures, TeX, uses mn.tex, submitted Oct 97 to MNRAS, waiting for referee's report
Scientific paper
10.1046/j.1365-8711.1999.02490.x
We collate the evidence for rotation-powered neutron stars that are visible as X-ray sources and not as radio pulsars. Quantitative upper limits exist for the radio fluxes of eight objects, revealing a population at least an order of magnitude less luminous at radio wavelengths than known radio pulsars of similar power or age. These objects could have intrinsically low radio luminosities, but a simple alternative explanation is that they are pulsars in which the radio beams are directed away from Earth. Where hard X-ray or gamma-ray fluxes are seen, the beaming explanation implies different emission sites for the high-energy radiation and the unseen radio beams. We estimate that (a) the radio beaming fraction of young pulsars is roughly 50%, certainly much less than 100%, and (b) one neutron star is born in the Galaxy every ~90 years. We conclude that probably all neutron stars are born as radio pulsars and that most young, nearby pulsars have already been discovered.
Brazier K. T. S.
Johnston Scott
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