- 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
- Volume | Issue number
- 388 | 4
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
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 x 10(6) 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 similar to 30 min, confirming that the source remains active in the quiescent state.
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