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 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..181k&link_type=abstract

XMM-Newton Proposal ID #04048602

Physics

Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, 4U 0142+61, 4U 0142+61, Xmm-Newton Proposal 04048602

Scientific paper

4U 0142+61 is a 8.7-s "anomalous X-ray pulsar" which, in data from our RXTE monitoring program, shows pulsations that are slowly but steadily getting brighter. Since 2000, the pulses have brightened by approximately 50%. In concert with the brightening, the pulse profile is clearly evolving on a comparable time scale. This behavior is unprecedented for an AXP and challenges the current magnetar model. We request two XMM observations of the source in Cycle 5 in order to monitor its phase-averaged flux and its spectrum, to try to shed light on the physical origin of this behavior.

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