Volume 447, Number 2, February IV 2006
|Page(s)||525 - 532|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||07 February 2006|
Low frequency radio monitoring of Cygnus X-1 and Cygnus X-3
Dept. of Physics, Mumbai University, Mumbai 400 098, India e-mail: email@example.com
2 NCRA, TIFR, Post Bag 3, Ganeshkhind, Pune 411 007, India
3 Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK
4 CNRS FRE 2591/CEA Saclay, DSM/DAPNIA/SAP, 91191 Gif-sur-Yvette Cedex, France
5 Tata Institute of Fundamental Research, Mumbai 400005, India
Accepted: 4 October 2005
We present the results of monitoring observations of the micro-quasars Cygnus X-1 and Cygnus X-3 at 0.61 and 1.28 GHz. The observations were performed with the Giant Meter-wave Radio Telescope between 2003 June and 2005 January. Variable, unresolved sources were found in both cases. Cyg X-1 was detected in about half of the observations, with a median flux density about 7 mJy at each frequency. The variations in Cyg X-1 may be due to refractive interstellar scintillation. Cyg X-3 was detected in each observation, and varied by a factor of 4. For this source, models of the scintillation suggest a very long timescale (the order of 40 yr at 1.28 GHz), therefore, we believe that the variations are intrinsic to the source.
Key words: binaries: general / ISM: jets and outflows / radio continuum: stars / accretion, accretion disks / radiation mechanisms: general
© ESO, 2006
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