A refined ephemeris and phase resolved X-ray spectroscopy of the Geminga pulsar

Details A refined ephemeris and phase resolved X-ray spectroscopy of the Geminga pulsar A refined ephemeris and phase resolved X-ray spectroscopy of the Geminga pulsar

2005-09-02

arxiv.org/abs/astro-ph/0509038v1

Astrophys.J.633:1114-1125,2005

Astronomy and Astrophysics

Astrophysics

11 pages, 11 figures To be published in Ap.J. v633 no.2

Scientific paper

10.1086/491615

We present a refined phase-connected post-glitch ephemeris for the Geminga pulsar that is a good fit to all the post-glitch data from EGRET, ASCA, and XMM. We also present the results of phase-resolved spectroscopy of two XMM X-ray observations of the Geminga pulsar obtained in 2002 and 2004. An investigation is made into a previously claimed existence of a small hot spot on the neutron star surface. We conclude that that interpretation was more likely an artifact of an overly restrictive assumption used to fit the phase-resolved spectra, namely, that the spectral index of the non-thermal component is constant. When we allow the spectral index to vary as a function of rotation phase, we find systematic variations in spectral index, and such fits do not require an additional, hot blackbody component.

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