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Abstract

We present observations of pulsed radio emission from the transient anomalous X-ray pulsar XTE J1810197.
Data were obtained over a period of 100 days beginning in 2006May using a baseband recording systemat the 26m
Mount Pleasant radio telescope operated by the University of Tasmania. Pulsed emission was detected in three
frequency bands centered on 1.4, 4.8, and 8.4 GHz. The mean flux density varied significantly within all bands, but
we obtained fewer detections toward the end of the observing period, and the monitoring program was eventually
abandoned.Most interestingly, we observed changes in the pulse-to-pulse emission characteristics. The variance of
the flux in 10 s integrations changed significantly during the span of our observations, but we did not have sufficient
data to identify a clear secular trend. In addition, timing measurements confirmed that the neutron star’s spin period
derivative changed significantly on or around MJD 53935.

Item Type:	Article
Authors/Creators:	Hotan, AW and Long, SR and Dickey, JM and Dolley, TJ
Journal or Publication Title:	The Astrophysical Journal
Publisher:	University of Chicago Press
ISSN:	0004-637X
Additional Information:	Copyright 2001, The American Astronomical Society.
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