Discovery of Radio Emission from Transient Anomalous X-ray Pulsar XTE J1810-197

Abstract

We report the first detection of radio emission from any anomalous X-ray pulsar (AXP). Data from the Very Large Array (VLA) MAGPIS survey with angular resolution 6" reveals a point-source of flux density 4.5 +/- 0.5 mJy at 1.4 GHz at the precise location of the 5.54 s pulsar XTE J1810-197. This is greater than upper limits from all other AXPs and from quiescent states of soft gamma-ray repeaters (SGRs). The detection was made in 2004 January, 1 year after the discovery of XTE J1810-197 during its only known outburst. Additional VLA observations both before and after the outburst yield only upper limits that are comparable to or larger than the single detection, neither supporting nor ruling out a decaying radio afterglow related to the X-ray turn-on. Another hypothesis is that, unlike the other AXPs and SGRs, XTE J1810-197 may power a radio synchrotron nebula by the interaction of its particle wind with a moderately dense environment that was not evacuated by previous activity from this least luminous, in X-rays, of the known magnetars.

13 pages, 1 figure, to appear in ApJ Letters

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• Fading of the Transient Anomalous X-ray Pulsar XTE J1810-197

Cited by in corpus (59)

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• Coherent radio emission from a twisted magnetosphere after magnetar-quake
• High Frequency Radio Observations of Two Magnetars, PSR J1622$-$4950 and 1E 1547.0$-$5408
• Variable Absorption Line in XTE J1810-197
• High-cadence monitoring of the emission properties of magnetar XTE J1810-197 with the Stockert radio telescope
• Possible evolution of dim radio quiet neutron star 1E 1207.4-5209 based on a B-decay model
• NICER Observations of the 2018 Outburst of XTE J1810-197
• X-ray and Radio Bursts from the Magnetar 1E1547.0-5408
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