Discovery of a Correlation between Post-Outburst Near-Infrared and X-ray Emission from the Anomalous X-ray Pulsar 1E 2259+586

Details Discovery of a Correlation between Post-Outburst Near-Infrared and X-ray Emission from the Anomalous X-ray Pulsar 1E 2259+586 Discovery of a Correlation between Post-Outburst Near-Infrared and X-ray Emission from the Anomalous X-ray Pulsar 1E 2259+586

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.0820t&link_type=abstract

American Astronomical Society, HEAD meeting #8, #08.20; Bulletin of the American Astronomical Society, Vol. 36, p.920

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On June 18 2002, the Anomalous X-ray Pulsar AXP 1E 2259+586 underwent a major X-ray outburst that lasted several hours and consequently linked AXP's to another class of high-energy bursting objects, called Soft Gamma-ray Repeaters (SGR). This was predicted uniquely by the "magnetar" model, in which these two classes are ultrahigh magnetic field, isolated young neutron stars. A few days after this outburst, Target of Opportunity observations were obtained with the Gemini North Near-InfraRed Imager (NIRI), followed by a longer term monitoring program of the IR variability that spanned nearly one and a half years. It was observed that shortly after the burst, the pulsar's Ks band flux dramatically increased relative to its pre-burst flux level, prompting the question "does the IR luminosity of 1E 2259+586 constantly undergo fluctuations, or can this brightening be undeniably associated with the X-ray outburst?" We present the results of our IR analysis, and relate them to the results of previous X-ray studies. There was clear evidence of a correlation between the IR flux decay and that of the long-term X-ray afterglow, implying that the IR enhancement was definitely linked to the outburst. We use this correlation to apply constraints on current AXP theoretical models.

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