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Variable radio source GT0116+622 is a possible counterpart to Cas γ-1

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Abstract

Identification of celestial γ-ray sources has proved to be very difficult because of the large positional uncertainties (typically several degrees) and the transient nature of many of these objects. Highly variable radio emission is a striking characteristic of the most secure source of very high-energy radiation, Cygnus X-3 (ref. 1). Here we report the discovery of another highly variable radio source which coincides in position with the transient TeV γ-ray source Cas γ-1. We have obtained an accurate radio position with the Very Large Array (VLA) telescope but no optical counterpart was found on the Mount Palomar Sky Survey prints. We have also obtained upper limits on radio emission from the binary X-ray pulsar, 4U0115+634, another proposed identification for Cas γ-1.

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Authors and Affiliations

  1. Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1W5

    P. C. Gregory, N. Duric, A. Reid, J. Picha & T. Stevenson

  2. Kapteyn Astronomical Institute, University of Groningen, 9700 AV, Groningen, The Netherlands

    A. R. Taylor

Authors
  1. P. C. Gregory
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  2. N. Duric
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  3. A. Reid
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  4. J. Picha
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  5. T. Stevenson
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  6. A. R. Taylor
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Gregory, P., Duric, N., Reid, A. et al. Variable radio source GT0116+622 is a possible counterpart to Cas γ-1. Nature 323, 602–603 (1986). https://doi.org/10.1038/323602a0

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  • DOI: https://doi.org/10.1038/323602a0

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