The GMRT frequency spectrum of Wolf - Rayet Galaxies

Shweta Srivastava1*, N. G. Kantharia2, D. C. Srivastava1 and Aritra Basu2
1D.D.U. Gorakhpur University, Gorakhpur, India
2NCRA-TIFR, Pune, India

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In this paper we discuss the observed spectral energy distribution from 150 MHz to 10 GHz in a sample of five Wolf-Rayet (WR) galaxies using data obtained from the GMRT and literature. The distance to the galaxies in our sample range from range from 4 - 60 Mpc and optical size from 0.8' - 9'. The WR galaxies are typically star-burst galaxies exhibiting spectral features typical of WR stars. While the higher frequency (ν >1.4 GHz) spectra have been found to be flatter compared to normal spiral galaxies, the low radio frequency spectra of the few galaxies that have been studied are found to exhibit a variety of shapes requiring a range of physical mechanisms giving rise to the emission, absorption and energy loss mechanisms to be active. We present the low radio frequency spectra of these galaxies, with a view to obtain the non-thermal spectral indices from model fitting and the influence of the environment.

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Keywords : galaxies – Wolf - Rayet – radio continuum – radio spectra