Journal
ASTROPHYSICAL JOURNAL
Volume 569, Issue 2, Pages 894-902Publisher
IOP PUBLISHING LTD
DOI: 10.1086/339351
Keywords
pulsars : individual (PSR J0437-4715); stars : neutron; X-rays : stars
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We report on spectral and timing observations of the nearest millisecond pulsar, J0437-4715, with the Chandra X-Ray Observatory. The pulsar spectrum, detected up to 7 keV, cannot be described by a simple one-component model. We suggest that it consists of two components: a nonthermal power-law spectrum generated in the pulsar magnetosphere, with a photon index gammaapproximate to2, and a thermal spectrum emitted by heated polar caps, with a temperature decreasing outward from 2 to 0.5 MK. The lack of spectral features in the thermal component suggests that the neutron star surface is covered by a hydrogen ( or helium) atmosphere. The timing analysis shows one X-ray pulse per period, with a pulsed fraction of about 40% and the peak at the same pulse phase as the radio peak. No synchrotron pulsar-wind nebula is seen in X-rays.
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