The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197

Details The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197 The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197

2007-05-28

arxiv.org/abs/0705.4095v2

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ; contains improved discussion of infrared uncertainties

Scientific paper

10.1086/521548

We have observed the 5.54s anomalous X-ray pulsar XTE J1810-197 at radio, millimeter, and infrared (IR) wavelengths, with the aim of learning about its broad-band spectrum. At the IRAM 30m telescope, we have detected the magnetar at 88 and 144GHz, the highest radio-frequency emission ever seen from a pulsar. At 88GHz we detected numerous individual pulses, with typical widths ~2ms and peak flux densities up to 45Jy. Together with nearly contemporaneous observations with the Parkes, Nancay, and Green Bank telescopes, we find that in late 2006 July the spectral index of the pulsar was -0.5

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