标题： 对Geminga脉冲星的改进星历和相位分辨X射线光谱学 显示英文标题

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

摘要： 我们提出了一个改进的相位连接的Geminga脉冲星消融后eFemeris，它很好地拟合了EGRET、ASCA和XMM的所有消融后数据。我们还介绍了2002年和2004年获得的两次XMM脉冲星X射线观测的相位分辨光谱的结果。研究了之前声称的中子星表面存在小热点的存在。我们得出结论，这种解释更可能是由于用于拟合相位分辨光谱的过于严格的假设造成的，即非热成分的光谱指数是恒定的。当我们允许光谱指数随旋转相位变化时，我们发现光谱指数有系统的变化，并且这些拟合不需要额外的热黑体成分。 显示英文摘要

摘要： 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.