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Title:
Optical/Infrared Observations of the Anomalous X-Ray Pulsar 1E 1048.1-5937 During Its 2007 X-Ray Flare
Authors:
Wang, Zhongxiang; Bassa, Cees; Kaspi, Victoria M.; Bryant, Julia J.; Morrell, Nidia
Affiliation:
AA(Department of Physics, Ernest Rutherford Physics Building, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AB(Department of Physics, Ernest Rutherford Physics Building, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AC(Department of Physics, Ernest Rutherford Physics Building, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.), AD(School of Physics, University of Sydney, NSW 2006, Australia.), AE(Las Campanas Observatory, Observatories of the Carnegie Institution of Washington, La Serena, Chile.)
Publication:
The Astrophysical Journal, Volume 679, Issue 2, pp. 1443-1446. (ApJ Homepage)
Publication Date:
06/2008
Origin:
UCP
ApJ Keywords:
Infrared: Stars, Stars: Pulsars: Individual: Alphanumeric: 1E 1048.1-5937, Stars: Neutron, X-Rays: Stars
Abstract Copyright:
(c) 2008: The American Astronomical Society
DOI:
10.1086/587505
Bibliographic Code:
2008ApJ...679.1443W

Abstract

We report on optical and infrared observations of the anomalous X-ray pulsar (AXP) 1E 1048.1-5937 made during its ongoing X-ray flare that started in 2007 March. We detected the source in the optical I and near-infrared Ks bands in two ground-based observations and obtained deep flux upper limits from four observations, including one with the Spitzer Space Telescope at 4.5 and 8.0 μm. The detections indicate that the source was approximately 1.3-1.6 mag brighter than in 2003-2006, when it was at the tail of a previous similar X-ray flare. Similar related flux variations have been seen in two other AXPs during their X-ray outbursts, suggesting common behavior for large X-ray flux variation events in AXPs. The Spitzer flux limits are sufficiently deep that we can exclude mid-infrared emission similar to that from the AXP 4U 0142+61, which has been interpreted as arising from a dust disk around the AXP. The optical/near-infrared emission from 1E 1048.1-5937 probably has a magnetospheric origin. The similarity in the flux spectra of 1E 1048.1-5937 and 4U 0142+61 challenges the dust disk model proposed for the latter.
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