Optical and Infrared Observations of Anomalous X-ray Pulsars

Authors :: Marten H. van Kerkwijk
Ferdi Hulleman
Martin Durant
Source :: Symposium - International Astronomical Union. 218:251-254
Publication Year :: 2004
Publisher :: Cambridge University Press (CUP), 2004.
Abstract: The detection of optical/infrared counterparts to Anomalous X-ray Pulsars (AXPs) has greatly increased our understanding of these systems. Models for the AXP phenomenon were based upon their X-ray emission, and all but the magnetar model made predictions for the optical/infrared that have now been falsified. With detections in hand, detailed studies of the optical/infrared to X-ray flux ratios, variability, and the spectral energy distributions have become possible. We present new data on two AXPs taken with Keck and Magellan, and compare the results with predictions made in the context of the magnetar model, in which the emission is due to ion currents flowing in the >10e14 G magnetosphere of young neutron stars.<br />4 pages, 2 figures. To appear in "Young Neutron Stars and Their Environments" (IAU Symposium 218, ASP Conference Proceedings), eds F. Camilo and B. M. Gaensler