Multi-frequency observation of Galactic micro-quasar Cygnus X-3 during flare

D. Patra1, S. Pal1*, C. H. Ishwara-Chandra2 and A. P. Rao2
1Indian Centre for Space Physics, 43 Chalantika, Garia Station Road, Kolkata, India
2National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune, 411007, India

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We studied the multi-frequency radio observations of the Galactic micro-quasar Cygnus X-3 using the Giant Metrewave Radio Telescope at 244, 325, 614 and 1280 MHz and Very Large Array at 8.43, 22.5 and 43.3 GHz during various flaring activities between 2006 to 2009. We have calculated the two point spectral index from the simultaneous observations at 244 and 614 MHz. These spectral index varies from positive (optically thick) and negative (optically thin) values which is consistent with the synchrotron self absorption model. We calculated some physical parameters such as the size of emitting region, turn over frequency and corresponding peak flux using the synchrotron self absorption model. The size of the emitting region are different at different time of the flare.

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Keywords : radio continuum: stars – X-rays: binaries – X-rays: individual: Cygnus X-3 – stars: flare