Abstract
We present the detection of a radio-emitting jet from the black hole candidate and X-ray binary source Cygnus X-1. Evidence of a bright core with a slightly extended structure was found on milliarcsecond resolution observations with the Very Long Baseline Array (VLBA) at 15.4 GHz. Later observations with the VLBA [and including the phased-up, Very Large Array (VLA)] at 8.4 GHz show an extended jet-like feature extending to ∼ 15 mas from a core region, with an opening angle of <20. In addition, lower resolution MERLIN observations at 5 GHz show that the source has <10 per cent linear polarization. The source was in the low/hard X-ray state during the observations, and the results confirm the existence of persistent radio emission from an unresolved core and a variable, relativistic (> 0.6c ) jet during this state.
Original language | English |
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Pages (from-to) | 1273-1278 |
Number of pages | 5 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 327 |
Issue number | 4 |
DOIs | |
Publication status | Published - 11 Nov 2001 |
Keywords
- Binaries: close
- ISM: jets and outflows
- Stars: individual: Cygnus X-1