Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-24
Astron.Astrophys.451:1009-1024,2006
Astronomy and Astrophysics
Astrophysics
18 pages, 19 figures, version accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20054403
The thermal emission from isolated neutron stars is not well understood. The X-ray spectrum is very close to a blackbody but there is a systematic optical excess flux with respect to the extrapolation to low energy of the best blackbody fit. This fact, in combination with the observed pulsations in the X-ray flux, can be explained by anisotropies in the surface temperature distribution.We study the thermal emission from neutron stars with strong magnetic fields in order to explain the origin of the anisotropy. We find (numerically) stationary solutions in axial symmetry of the heat transportequations in the neutron star crust and the condensed envelope. The anisotropy in the conductivity tensor is included consistently. The presence of magnetic fields of the expected strength leads to anisotropy in the surface temperature. Models with toroidal components similar to or larger than the poloidal field reproduce qualitatively the observed spectral properties and variability of isolated neutron stars. Our models also predict spectral features at energies between 0.2 and 0.6 keV.
Miralles Juan A.
Perez-Azorin Fernando J.
Pons Jose A.
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