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2nd of April 2019
Wideband polarized radio emission from XTE J1810-197
by Dai et al.
The anomalous X-ray pulsar XTE J1810-197 was the first magnetar found to emit pulsed radio emission. After spending almost a decade in a quiescent, radio-quiet state, the magnetar was reported to have undergone a radio outburst in 2018 December. We observed radio pulsations from XTE J1810-197 during this early phase of its radio revival using the Ultra-Wideband Low receiver system of the Parkes radio telescope, obtaining wideband (704 MHz to 4032 MHz) polarization pulse profiles, single pulses and flux density measurements. The picture here shows the average polarization pulse spectra for XTE J1810-197 taken on 2018 December 11. From left to right, we show total intensity (Stokes I), linear polarization, and circular polariation (Stokes V), normalized by their peak values. The position angle of the linear polarization (over each 128 MHz subband) is shown as white solid lines. The length of lines represents the fraction of linear polarization. The observed wideband polarization properties are significantly different compared to those taken after the 2003 outburst, and therefore provide new information about the origin of radio emission. More details are given in the preprint of the paper, which will be published in Astrophysical Journal Letters.

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