An expanding plasmon model for the radio outbursts of CIR X-1

Details An expanding plasmon model for the radio outbursts of CIR X-1 An expanding plasmon model for the radio outbursts of CIR X-1

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995yera.conf....6g&link_type=abstract

The XXVIIth Young European Radio Astronomers Conference, ed. D.A. Green and W. Steffen, in association with Cambridge University

Astronomy and Astrophysics

Astronomy

Scientific paper

The group of radio emitting X-ray binaries (XRB's), such as SS433, Cyg X- 3, LSI+61d303, Cir X-1, etc., exhibit highly variable bursting radio emission interpreted as synchrotron radiation from relativistic electrons. It is possible that these electrons have been shock-accelerated after supercritical accretion episodes onto the system compact companion. Supercritical accretion rates occur when the Eddington accretion limit is exceeded, normally during periastron passage. In this paper, a numerical model for radio outbursts in XRB's is developed. The model is based on a process of continuous injection of relativistic particles into a spherical expanding plasmon, ejected following a transitory supercritical accretion event onto the compact star. The relativistic electrons lose their energy by adiabatic expansion, synchrotron radiation and inverse Compton effect. Calculations have been carried out for Cir X-1, a XRB exhibiting 16.6 d periodic X-ray and radio outbursts. The model is applied considering the evolution of two consecutive spherical plasmons to account for the double-peaked radio flares from Cir X-1, observed at multi-frequency during the outburst of 1977 May 12-15. A satisfactory fit of the radio light curves with two plasmon ejection events is obtained.

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