Spitzer DDT observations of the anomalous X-ray pulsar 4U 0142+61

Details Spitzer DDT observations of the anomalous X-ray pulsar 4U 0142+61 Spitzer DDT observations of the anomalous X-ray pulsar 4U 0142+61

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop..287w&link_type=abstract

Spitzer Proposal ID #287

Physics

Scientific paper

Previous Spitzer/IRAC observations have discovered the mid-IR counterpart to anomalous X-ray pulsar (AXP) 4U 0142+61. The discovery may indicate the first detection of a fallback disk around a young, isolated neutron star. The putative disk likely formed from fallback material in the supernova explosion that produced the neutron star. The disk is likely bright in the mid-IR due to irradiation by the strong X-rays from the pulsar. At 10:04:19 UTC on 7 February 2007, the AXP exhibited a large fast-rise X-ray burst, with the peak X-ray flux being more than 100 times higher than its quiescent X-ray flux. Here we request Spitzer/IRAC observations of the source. Combining them with our scheduled Chandra ToO X-ray observations of the source, we will be able to test the disk model by searching for correlated mid-IR/X-ray flux changes. If correlated flux changes are found, the observations would allow us to further study the properties of the disk.

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