Nearby radio-quiet isolated neutron stars with strong magnetic fields
Presently seven radio-quiet isolated neutron stars with thermal X-ray emission are known. Their X-ray spectra are characterized by soft blackbody-like emission (kT ~ 45-120 eV) without indication for harder, non-thermal components. These stars apparently show no radio emission and no association with supernova remnants. Five of them exhibit pulsations in their X-ray flux with periods in the range of 3.45 s to 11.37 s.
XMM-Newton observations revealed broad absorption lines in the X-ray spectra which may be caused by cyclotron resonance absorption of protons or heavy ions. I'll review our present knowledge about this group of isolated neutron stars with particular emphasis on their X-ray properties.
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