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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. Poo ley
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Abstract

We present millimetre wavelength observations of the black hole candidate X-ray binary Cygnus X-1 which 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.

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S. P. Tigelaar, R. P. Fender, R. P. J. Tilanus, E. Gallo, G. G. Poo ley. 2004-05-07. Quenched millimetre emission from Cygnus X-1 in a soft X-ray state. https://doi.org/10.1111/j.1365-2966.2004.07992.x

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