Low frequency study of Luminous Infra-Red Galaxies (LIRGs)

A. Goyal1*, N. G. Kantharia2, S. K. Sirothia2, C. H. Ishwara-Chandra2 and Gopal-Krishna3
1Astronomical observatory, Jagiellonian university, Orla 171, 30-244 Krakow, Poland
2National Centre for Radio Astrophysics-Tata Institute of Fundamental Research, Ganeshkhind, 411007 Pune, India
3IUCAA, Post Bag 4, Pune University Campus, Ganeshkhind, Pune 411007, India

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We present the results of low frequency continuum imaging of a sample of 11 luminous infra-red galaxies (LIRGs) detected in the TIFR GMRT Sky Survey (TGSS) data release 4 (DR4). With the availability of TGSS data, the radio spectra have been constrained down to 150 MHz. Our results indicate that the median spectral index between 150 and 325 MHz is slightly flatter (α325 150 = −0.34) than the median spectral indices between 325 and 610 MHz (α610 325 = −0.59) and between 610 and 1400 MHz (α1400 610 = −0.64), the latter being close to optically thin synchrotron emission.

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Keywords : Galaxies: infra-red – galaxies – radio imaging