Powering Anomalous X-ray Pulsars by Neutron Star Cooling

Details Powering Anomalous X-ray Pulsars by Neutron Star Cooling Powering Anomalous X-ray Pulsars by Neutron Star Cooling

1997-08-20

arxiv.org/abs/astro-ph/9708179v2

Astrophys.J. 489 (1997) L67

Astronomy and Astrophysics

Astrophysics

8 pages, 1 figure, to appear in Ap.J. Letters (one reference entry corrected, no other changes)

Scientific paper

10.1086/310964

Using recently calculated analytic models for the thermal structure of ultramagnetized neutron stars, we estimate the thermal fluxes from young ($t\sim 1000$ yr) ultramagnetized ($B \sim 10^{15}$ G) cooling neutron stars. We find that the pulsed X-ray emission from objects such as 1E 1841-045 and 1E 2259+586 as well as many soft-gamma repeaters can be explained by photon cooling if the neutron star possesses a thin insulating envelope of matter of low atomic weight at densities $\rho < 10^{7}-10^{8}$ g/cm$^3$. The total mass of this insulating layer is $M \sim 10^{-11}-10^{-8} M_\odot$.

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