The unusual radio transient in M82: An SS433 analogue?

T. D. Joseph, T. J. Maccarone, R. P. Fender

Research output: Contribution to journalArticle

11 Scopus citations


In this Letter we discuss the recently discovered radio transient in the nuclear region of M82. It has been suggested that this source is an X-ray binary, which, given the radio flux density, would require an X-ray luminosity,LX~ 6 × 1042ergs-1 if it were a stellar mass black hole that followed established empirical relations for X-ray binaries. The source is not detected in the analysis of the X-ray archival data. Using a 99 per cent confidence level upper limit we find thatLX≤ 1.8 × 1037and 1.5 × 1037ergs-1, using power law and disc blackbody models, respectively. The source is thus unlikely to be a traditional microquasar, but could be a system similar to SS433, a Galactic microquasar with a high ratio of radio to X-ray luminosity.

Original languageEnglish
Pages (from-to)L59-L63
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
StatePublished - Jul 2011


  • Galaxies: individual: M82
  • X-rays: galaxies

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