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Diffuse radio emission in galaxy clusters: surveys and new detections

by Dr. Ruta Kale (INAF IRA)

Sep 23, 2013 from 02:30 PM to 04:30 PM

Where Meeting room (4th floor), Institute of Radioastronomy

Contact Name Marcello Giroletti

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Abstract: Radio halos, radio relics and mini-halos are forms of diffuse radio emission in galaxy clusters giving an insight to the non-thermal processesin the intra-cluster medium. The origins of these sources continue topuzzle theorists and observers although the understanding of these sources is growing. The Extended GMRT Radio Halo Survey aims to providestatistical properties of radio halos in a large sample of galaxyclusters. I will present recent results from this survey which is nearing completion. The massive clusters detected by the Planck satellite andother instruments (ACT, SPT) using the Sunyaev Ze'ldovich effect arefavoured hosts for diffuse radio emission. We have carried out a follow-up of Planck detected clusters with the GMRT and the JVLA to confirm thepresence of suspected diffuse emission. I will present the detections of aradio halo and a candidate new radio relic with the JVLA at 1.5 GHz and the GMRT at 610 and 240 MHz.

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