GMRT and LOFAR low frequency observations of the gamma-ray binaries

B. Marcote1*, M. Ribó1, J. M. Paredes1, C. H. Ishwara-Chandra2,J. Swinbank3, J. Broderick4,5, S. Markoff3, R. Fender4,5 and R. Wijers3
1Dept. d’Astronomia i Meteorologia, Institut de Ciències del Cosmos, Universitat de Barcelona, IEEC-UB, Martí Franquès 1, E08028 Barcelona, Spain
2National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune University Campus
3Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, the Netherlands
4Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, UK
5University of Oxford, Department of Physics, Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK

View Full Article: [PDF]


Radio observations of gamma-ray binaries are fundamental to reveal their nature, as well as to understand the physics behind these energetic sources. Only a handful of systems are known and their low frequency emission remains almost unexplored up to now. Here we present the results of GMRT and LOFAR observations of two gamma-ray binaries: LS 5039 and LS I +61 303. For the first one, a turnover in the spectrum is reported for frequencies below 1 GHz. For LS I +61 303 the preliminary data analysis shows that enhanced radio emission around orbital phase ɸ = 0 is observed at 610 MHz, while emission with only a small variability on secular timescales is detected at 235 MHz.

<< Previous Article | Next Article >>    Back to Asics_Vol_013

Keywords : gamma rays: binaries – radio continuum:stars – radiation mechanism: non-thermal