Detailed spectral analysis of the 260 ksec XMM-Newton data of 1E1207.4-5209 and significance of a 2.1 keV absorption feature

Astronomy and Astrophysics – Astronomy

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Scientific paper

We report on a detailed reanalysis of the 260 ksec Newton observation of 1E1207.4-5209. Previous analyses (Bignami et al. 2003 & De Luca et al. 2004) claimed the existence of a third and fourth spectral feature, in addition to the two absorption features detected at lower energies. Particular attention has been given to treatment of the continuum uncertainty and instrumental effects and to utilizing proper statistical techniques to assess the significance of the higher energy features. We have found that both these higher energy features are statistically insignificant, as is the claimed phase variation of the third spectral feature. This conclusion is robust and encompasses all reasonable physical models and methods of statistical analysis. We also explain how the previous analyses reached a conclusion at odds with our reanalysis.

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