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.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science