Log N -- Log S distributions of accreting and cooling isolated neutron stars
Abstract
We model populations of isolated neutron stars in the Galaxy following their orbital and magneto-rotational evolution. It is shown that accretors become more abundant than coolers at fluxes below 10-13 erg cm-2 s-1, and one can predict that about one accreting neutron star per square degree should be observed at the Chandra and Newton flux limits of 10-16 erg cm-2 s-1. The soft ROSAT sources associated with isolated neutron stars can be relatively young cooling objects only if the neutron star birth rate in the Solar vicinity during the last 106 yr is higher than that inferred from radiopulsar observations.
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