Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..49..169l&link_type=abstract
Astrophysics and Space Science, vol. 49, no. 1, June 1977, p. 169-177. ERDA-NSF-supported research.
Astronomy and Astrophysics
Astrophysics
7
Gravitational Collapse, Pulsars, Spatial Distribution, Star Distribution, Stellar Luminosity, Milky Way Galaxy, Radio Telescopes, Stellar Evolution, Thresholds
Scientific paper
Cavallo (1973) has pointed out that the detection thresholds of radio telescopes have been biased in such a fashion that only the nearby ones are detected with high efficiency. This effect is demonstrated by calculating the maximum distance at which a low-luminosity pulsar can be detected with high efficiency and also by comparing the observed and expected spatial distributions of pulsars as a function of distance from earth. The local density of observed pulsars is determined and converted into an estimate of the local density of 'potentially visible' pulsars. This latter density is then compared with the local matter density, and the effective pulsar lifetime is estimated. It is suggested that a stellar collapse into a pulsar is likely to occur roughly every four years in the Galaxy, with a possible range of one collapse every two to seven years.
Lande Kenneth
Stephens W. E.
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