Other
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.346...40s&link_type=abstract
Nature (ISSN 0028-0836), vol. 346, July 5, 1990, p. 40-42. Research supported by the Ministero Italiano per la Ricerca Scientifi
Other
27
Dark Matter, Electron Density (Concentration), Free Electrons, H I Regions, Pulsars, Electron Decay Rate, Ionizing Radiation, Photoionization, Radioactive Decay
Scientific paper
It was recently proposed that the free electrons giving rise to the observed dispersion of pulsar signals result mainly from photoionization induced by the decay of dark matter particles in the Galaxy. A crucial prediction of the theory is that in regions where the dark matter density is approximately constant, the free electron density in opaque H I regions should also be approximately constant when averaged over several mean free paths for the ionizing photons. The determination of an accurate distance for the pulsar PSR1451-68, in combination with its known dispersion measure and with previous observations of two other pulsars with accurate distances, leads to a successful test of this prediction.
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