XMM-Newton observations of the γ-ray pulsar J0633+0632

Abstract

We briefly report the results of XMM-Newton X-ray observations of the γ-ray pulsar J0633+0632. We detected, for the first time, X-ray pulsations from J0633+0632 with the pulsar period. The pulse profile is typical for spin-modulated thermal emission from the surface of a neutron star. The pulsed fraction in the 0.3–2 keV band is 23 ± 6%. We confirmed previous results that the X-ray spectrum of J0633+0632 contains a non-thermal power law and a thermal (described either by the blackbody or the neutron star atmosphere models) components. However, XMM-Newton observations do not confirm the absorption line in the pulsar spectrum at ≈ 0.8 keV found in the Chandra data (Danilenko et al 2015 PASA 32 e038).Using the interstellar absorption–distance relations, we constrained the distance to the pulsar in the range of 0.7–2.2 kpc.