Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop..298w&link_type=abstract
Spitzer Proposal ID #298
Physics
Scientific paper
The anomalous X-ray pulsar (AXP) 1E 1048.1-5937 is one of a dozen sources believed to be magnetars---young neutron stars with extremely strong magnetic fields (~10^14 G). On 2007 April 3, a sudden spin-up (glitch) and X-ray flux enhancement event in the AXP was detected in our RXTE X-ray monitoring observations of the source. Our follow-up Magellan ToO and ESO/VLT DDT observations find that the source's optical/near-IR counterpart has brightened by more than 1.3 mag (compared to the previous measurements in 2003). The current X-ray and near-IR fluxes of the AXP both predict detectable mid-IR emission from the source by Spitzer. Therefore, we propose a Spitzer/IRAC imaging observation of the source, seeking to detect the source in the mid-IR and to probe if there is a similar degree of brightening in the mid-IR. If detected, this would allow us to construct the second optical/IR spectral energy distribution for magnetars, thus helping understand the physical origin for the still mysterious optical and IR emission in magnetars.
Kaspi Victoria
Wang Zhong-xiang
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