Polarized radio emission from the magnetar XTE J1810-197

Abstract

We have used the Parkes radio telescope to study the polarized emission from the anomalous X-ray pulsar XTE J1810-197 at frequencies of 1.4, 3.2, and 8.4 GHz. We find that the pulsed emission is nearly 100% linearly polarized. The position angle of linear polarization varies gently across the observed pulse profiles, varying little with observing frequency or time, even as the pulse profiles have changed dramatically over a period of 7 months. In the context of the standard pulsar "rotating vector model," there are two possible interpretations of the observed position angle swing coupled with the wide profile. In the first, the magnetic and rotation axes are substantially misaligned and the emission originates high in the magnetosphere, as seen for other young radio pulsars, and the beaming fraction is large. In the second interpretation, the magnetic and rotation axes are nearly aligned and the line of sight remains in the emission zone over almost the entire pulse phase. We deprecate this possibility because of the observed large modulation of thermal X-ray flux. We have also measured the Faraday rotation caused by the Galactic magnetic field, RM = +77 rad/m^2, implying an average magnetic field component along the line of sight of 0.5 microG.

arXiv commentAccepted for publication in ApJ Letters. Six pages with 4 figures

References in corpus (11)

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• Transient pulsed radio emission from a magnetar
• Pulsar rotation measures and the large-scale structure of Galactic magnetic field
• Emission Beam Geometry of Selected Pulsars Derived from Average Pulse Polarization Data
• Discovery of a New Transient Magnetar Candidate: XTE J1810-197
• Evidence for alignment of the rotation and velocity vectors in pulsars
• Profile morphology and polarization of young pulsars
• Discovery of Radio Emission from Transient Anomalous X-ray Pulsar XTE J1810-197
• The Spectral Evolution of Transient Anomalous X-ray Pulsar XTE J1810--197
• Absolute polarisation position angle profiles of southern pulsars at 1.4 and 3.1 GHz
• Single Dish Polarization Calibration

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