Pulse-phase spectroscopy of the anomalous X-ray pulsar 1E 1048.1-5937 in a low

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Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, 1E 1048.1-5937

Scientific paper

1E 1048.1-5937 is the magnetar candidate with the largest pulsed fraction, that is observed to be anti-correlated to the source flux. At the lowest flux level, the 1-10 keV pulsed fraction is >90% and a soft X-ray spectral component, possibly due to thermal emission from most of the magnetar surface, emerges at pulse-phase minimum. This source state provides the best opportunity to study through phase-resolved spectroscopy both the non-thermal and thermal emission from regions of the magnetar surface at different temperatures. Since the only available observation of 1E 1048.1-5937 in this low flux state is a 5 ks XMM-Newton observation, we propose a deeper 80 ks observation, to be performed in case the 2-10 keV flux falls below 4E-12 erg cm-2 s-1.

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