SIMBAD references

1999MNRAS.302L...1P - Mon. Not. R. Astron. Soc., 302, L1-L5 (1999/January-1)

Orbital modulation and longer term variability in the radio emission from Cygnus X-1.


Abstract (from CDS):

20 months of observations of the radio emission at 15 GHz from Cygnus X-1, starting in 1996 October, show variations at the binary period of 5.6 d, but with a phase offset from those at X-ray wavelengths. There are also longer term variations on a time-scale of 150 d, which are only loosely related to the soft X-ray flux. The source was in the hard/low X-ray state throughout this period. The mean 15-GHz flux density is 13 mJy, the radio spectrum is flat and the semi-amplitude of the orbital modulation is about 2 mJy. We discuss the possible origins of the modulation and the relationship to the soft X-ray emission.

Abstract Copyright: 1998, Royal Astronomical Society

Journal keyword(s): stars: individual: Cyg X - radio continuum: stars - X-rays: stars

Simbad objects: 4

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