Detection of pulsed X-ray emission from XMM-Newton observations of PSR J0538+2817

K. E. McGowan, J. A. Kennea, S. Zane, F. A. Córdova, M. Cropper, C. Ho, T. Sasseen, W. T. Vestrand

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We report on the XMM-Newton observations of the 143 ms pulsar PSR J0538+2817. We present evidence for the first detections of pulsed X-rays from the source at a frequency that is consistent with the predicted radio frequency. The pulse profile is broad and asymmetric, with a pulse fraction of 18% ± 3%. We find that the spectrum of the source is well-fitted with a blackbody with T = (2.12-0.03+0.04) × 106 K and NH = 2.5 × 1021 cm -2. The radius determined from the model fit of 1.68 × 0.05 km suggests that the emission is from a heated polar cap. A fit to the spectra with an atmospheric model reduces the inferred temperature and, hence, increases the radius of the emitting region; however, the pulsar distance determined from the fit is then smaller than the dispersion distance.

Original languageEnglish (US)
Pages (from-to)380-387
Number of pages8
JournalAstrophysical Journal
Issue number1 I
StatePublished - Jul 1 2003

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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