Monitoring a Recovering AXP and Measuring Pdot

Details Monitoring a Recovering AXP and Measuring Pdot Monitoring a Recovering AXP and Measuring Pdot

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.2291k&link_type=abstract

Chandra Proposal ID #07508256

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Chandra Proposal Id #07508256

Scientific paper

Anomalous X-ray Pulsar (AXP) outbursts are rare, occuring roughly once per decade per src, and offer rare opportunities to constrain the poorly understood physics of magnetars. Recently AXP CXO 164710.2-455216.9 went into outburst and we were granted 3 ToO obs with CXO. These obs together, via phase-coherent timing, set the best constraint on the unknown Pdot, which implies magnetic field (3sig) <2e14 G. This is low for a magnetar but not yet a problem. We request 1 more 25 ks DDT obs of AXP CXO 164710.2-455216.9. This obs will continue to monitor it back to quiescence to distinguish between proposed recovery models, and, importantly, if scheduled near Oct 30, will either detect or put an unprecedented upper limit on Pdot, via phase connection with previous CXO ToO obs. If no Pdot is detected, we will constrain B<5e13G (3sig), lower than for any other known magnetar (lowest known 6e13G), and perplexingly below B measured for some ordinary, non-magnetar neutron stars.

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