XMM Monitoring of the Evolving AXP 4U 0142+61

Details XMM Monitoring of the Evolving AXP 4U 0142+61 XMM Monitoring of the Evolving AXP 4U 0142+61

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..150k&link_type=abstract

XMM-Newton Proposal ID #05038602

Physics

Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, 4U 0142+61, 4U 0142+61, Xmm-Newton Proposal 05038602

Scientific paper

4U 0142+61 is a 8.7-s anomalous X-ray pulsar (AXP) which, in data from our RXTE monitoring program, recently showed pulsations that were slowly but steadily getting brighter (24% increase in 6 yr), in concert with a slow evolution of its soft X-ray pulse profile. Such behavior is unprecedented for an AXP and challenges the current magnetar model. We request XMM observations of the source in Cycle 6 in order to monitor its phase-averaged flux and its spectrum, to try to shed light on the physical origin of this surprising behavior, as well as to better characterize recent and apparently ongoing bursting activity in the source.

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