Discovery of Radio Emission From Transient Anomalous X-Ray Pulsar XTE J1810-197

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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 ... continued below

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Halpern, J P; Gotthelf, E V; Becker, R H; Helfand, D J & White, R L October 25, 2005.

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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.

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PDF-file: 15 pages; size: 0 Kbytes

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  • Journal Name: The Astrophysical Journal Letters; Journal Volume: 632

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  • Report No.: UCRL-JRNL-217012
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 886673
  • Archival Resource Key: ark:/67531/metadc892549

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  • October 25, 2005

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  • Sept. 23, 2016, 2:42 p.m.

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  • Dec. 7, 2016, 10:52 a.m.

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Halpern, J P; Gotthelf, E V; Becker, R H; Helfand, D J & White, R L. Discovery of Radio Emission From Transient Anomalous X-Ray Pulsar XTE J1810-197, article, October 25, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc892549/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.