The low-frequency radio emission in galaxy clusters

M. Pandey-Pommier1*, J. Richard1, F. Combes2, K. Dwarakanath3, B. Guiderdoni1, D. Narasimha4, S. Sirothia5, P. Brembaux1 and S. Bhandari3
1Université de Lyon, Lyon, F−69003; Université Lyon 1, Observatoire de Lyon, 9 avenue Charles André, Saint−Genis Laval,France
2LERMA, Observatoire de Paris, 61 avenue de l’Observatoire, 75014 Paris, France
3Raman Research Institute, Bangalore 560 080, India
4Theoretical Astrophysics Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005, India
5National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Ganeshkhind, Pune 411007, India

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Larger scale structures in the Universe are formed by massive Galaxy clusters that grow via mergers of smaller clusters and galaxy groups. Multiple frequency radio emissions arising from such massive clusters were investigated in this work, in order to study the nature of low frequency non-thermal emission that are generated within their ongoing merger events. To probe further, the non-thermal and thermal components of the intra cluster medium and their interaction during cluster collisions, Chandra X-ray data was used. GMRT data presented on 5 massive clusters in this paper reveals the presence of diffuse radio structures in the form of halos, relics and mini-halos in these systems. Furthermore, we discuss the statistical properties of radio power at 1.4 GHz and X-ray luminosity in galaxy clusters and highlight the importance of contribution from LOFAR and SKA in this field.

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