Comptonization in the X-ray Spectra of Radio Millisecond Pulsars

Details Comptonization in the X-ray Spectra of Radio Millisecond Pulsars Comptonization in the X-ray Spectra of Radio Millisecond Pulsars

2006-12-20

arxiv.org/abs/astro-ph/0612591v2

Astronomy and Astrophysics

Astrophysics

Proceedings of the 363. WE-Heraeus Seminar on: Neutron Stars and Pulsars (Posters and contributed talks) Physikzentrum Bad Hon

Scientific paper

The majority of X-ray-detected rotation-powered millisecond pulsars (MSPs) appear to exhibit predominantly thermal emission, believed to originate from the heated magnetic polar caps of the pulsar. In the nearest MSP, J0437--4715 a faint PL is also observed at >3 keV, usually associated with magnetospheric emission processes. However, the hard emission in this and other similar MSPs may instead be due to weak Comptonization of the thermal polar cap emission by energetic electrons/positrons of small optical depth most likely in the pulsar magnetosphere. This spectral model implies that all soft X-rays are of purely thermal origin, which has important implications in the study of neutron stars.

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