Zooming in on a sleeping giant: Milliarcsecond High Sensitivity Array imaging of the black hole binary V404 Cyg in quiescence

J. C.A. Miller-Jones, E. Gallo, M. P. Rupen, A. J. Mioduszewski, W. Brisken, R. P. Fender, P. G. Jonker, T. J. Maccarone

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Abstract

Observations of the black hole X-ray binary V404 Cyg with the very long baseline interferometer the High Sensitivity Array (HSA) have detected the source at a frequency of 8.4 GHz, providing a source position accurate to 0.3 mas relative to the calibrator source. The observations put an upper limit of 1.3 mas on the source size (5.2 au at 4 kpc) and a lower limit of 7 × 106 K on its brightness temperature during the normal quiescent state, implying that the radio emission must be non-thermal, most probably synchrotron radiation, possibly from a jet. The radio light curves show a short flare, with a rise time of ∼30 min, confirming that the source remains active in the quiescent state.

Original languageEnglish (US)
Pages (from-to)1751-1758
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume388
Issue number4
DOIs
StatePublished - Aug 1 2008

Keywords

  • Astrometry
  • ISM: jets and outflows
  • Radio continuum: stars
  • Stars: individual: V404 Cyg
  • X-rays: binaries

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    Miller-Jones, J. C. A., Gallo, E., Rupen, M. P., Mioduszewski, A. J., Brisken, W., Fender, R. P., Jonker, P. G., & Maccarone, T. J. (2008). Zooming in on a sleeping giant: Milliarcsecond High Sensitivity Array imaging of the black hole binary V404 Cyg in quiescence. Monthly Notices of the Royal Astronomical Society, 388(4), 1751-1758. https://doi.org/10.1111/j.1365-2966.2008.13495.x