Log N -- Log S distributions of accreting and cooling isolated neutron stars

Details Log N -- Log S distributions of accreting and cooling isolated neutron stars Log N -- Log S distributions of accreting and cooling isolated neutron stars

2000-09-14

arxiv.org/abs/astro-ph/0009225v2

Astrophys.J. 544 (2000) L53

Astronomy and Astrophysics

Astrophysics

5 pages, 3 PostScript figures, accepted to ApJ, new figures 2,3

Scientific paper

10.1086/317295

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 $\sim 10^{-13}$ erg cm$^{-2}$ s$^{-1},$ and one can predict that about one accreting neutron star per square degree should be observed at the {\it Chandra} and {\it Newton} flux limits of $\sim 10^{-16}$ 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 $\sim 10^6$ yr is higher than that inferred from radiopulsar observations.

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