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X Rays from Old Neutron Stars Heated by Axion Stars

Aiichi Iwazaki

hep-pharXiv:hep-ph/9906353

Abstract

We show that axionic boson stars collide with isolated old neutron stars with strong magnetic field (>108 Gauss) and causes the neutron stars to radiate X ray by heating them. Surface temperatures of such neutron stars becomes105 K 106 K. We suggest that these are possible candidates for X ray sources observed in ROSAT Survey. We discuss a possible way of identifying such neutron stars. We also point out that the collision generates a burst of monochromatic radiations with frequency given by axion mass.

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