Quenched millimetre emission from Cygnus X-1 in a soft X-ray state

S. P. Tigelaar, R. P. Fender, R. P.J. Tilanus, E. Gallo, G. G. Pooley

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We present millimetre wavelength observations of the black hole candidate X-ray binary Cygnus X-1 that indicate a suppression, or quenching, of the emission as the source switches to a softer X-ray state. Combining the data with those for another black hole candidate, XTE J1118+480, we demonstrate that the millimetre emission shows the same coupling to X-rays as the radio emission, although with a much stronger sensitivity to spectral shape. We therefore confirm the association of the millimetre emission with the jets in low-hard, state black hole candidate X-ray binaries.

Original languageEnglish (US)
Pages (from-to)1015-1018
Number of pages4
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Aug 11 2004
Externally publishedYes


  • Ism: jets and outflows
  • Stars: individual: Cygnus X-1
  • Submillimetre

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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