X‐Ray and Infrared Enhancement of Anomalous X‐Ray Pulsar 1E 2259+586

The long term (~1.5 years) X-ray enhancement and the accompanying infraredenhancement light curves of the anomalous X-ray pulsar 1E 2259+58 following themajor bursting epoch can be accounted for by the relaxation of a fall back diskthat has been pushed back by a gamma-ray flare. The required burst energyestimated from the results of our model fits is low enough for such a burst tohave remained below the detection limits. We find that an irradiated disk modelwith a low irradiation efficiency is in good agreement with both X-ray andinfrared data. Non-irradiated disk models also give a good fit to the X-raylight curve, but are not consistent with the infrared data for the first weekof the enhancement.Comment: 17 pages, 3 figures, accepted for publication in Ap