A possible faint near-infrared counterpart to the AXP 1E~2259+58.6
arXiv:astro-ph/0110172 · doi:10.1086/338478
Abstract
We present near-infrared and optical observations of the field of the Anomalous X-ray Pulsar 1E 2259+58.6 taken with the Keck telescope. We derive a subarcsecond Chandra position and tie it to our optical reference frame using other stars in the field. We find a very faint source, Ks = 21.7\pm0.2 mag, with a position coincident with the Chandra position. We argue that this is the counterpart. In the J, I, and R bands, we derive (2 sigma) limits of 23.8, 25.6 and 26.4 mag, respectively. As with 4U 0142+61, for which a counterpart has previously been found, our results are inconsistent with models in which the source is powered by accretion from a disk, but may be consistent with the magnetar model.
12 pages, 2 figures, accepted for ApJ Letters A manuscript with full resolution figures can be found at http://www.phys.uu.nl/~hulleman/e2259paper2.ps.gz
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