Simultaneous millimetre and radio observations of Cygnus X-3 in a quiescent radio state

Details Simultaneous millimetre and radio observations of Cygnus X-3 in a quiescent radio state Simultaneous millimetre and radio observations of Cygnus X-3 in a quiescent radio state

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274..633f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 2, pp. 633-638.

Astronomy and Astrophysics

Astronomy

19

Binaries: Close, Circumstellar Matter, Stars: Individual: Cyg X-3, Radio Continuum: Stars

Scientific paper

Observations of Cygnus X-3 at 2.0 and 1.1 mm with the JCMT, partially simultaneous with radio flux measurements at 2 cm and 18 cm, are presented. These are the first known observations of Cyg X-3 at millimetre wavelengths whilst the source was in a quiet radio state. The observed millimetre fluxes are several times greater than those expected for the synchrotron tail of emission extrapolated from the radio, and the 2-mm flux exceeds that at 1.1 mm, suggesting a peak in the region of a few mm. The observations are interpreted using an extension of the model of Marti, Paredes & Estalella to repeated short injections of relativistic electrons in a region in the Cyg X-3 stellar wind which is optically thin to millimetre-wave photons, but optically thick at centimetre wavelengths. Centimetre-wavelength emission is not observed until the ejecta have travelled further out in the wind. A MERLIN radio map at 18 cm reveals the same elliptical asymmetry in the scattering medium around Cyg X-3 as found by Wilkinson, Narayan & Spencer.

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