Title:	A Steep spectrum radio halo in merging galaxy cluster- MACSJ0416.1-2403
Authors:	Pandey-Pommier, M. Weeren, R.R.Van. Ogrean, G.A. Dwarakanath, K.S. +11 Co-authors
Keywords:	MACSJ0416.1-2403
Issue Date:	Dec-2015
Publisher:	Société Française d’Astronomie et d’Astrophysique (SF2A),
Citation:	Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics.Edited by F. Martins et al ,held at Toulouse, France from 2-5th June 2015, page 247-252
Abstract:	Steep Spectrum Radio Halos (RH) are very rare diffuse structures existing in the central region of merging galaxy clusters. Due to their steep spectral nature, they are often not detected at higher frequencies and tend to shine only at very low frequencies. They represent a new class of objects that could be either old halos or clusters at a special time of the merger event, when particle acceleration processes have a lower efficiency. The comparison of theoretical predictions with the low frequency observations clearly suggests that there is yet a large population of very faint RHs in galaxy clusters that still remains to be discovered with steep spectrum RHs expected to dominate this undiscovered population. As the number counts of these steep spectrum RHs is scarce, discovery of even a couple of them is important. We present result on cluster MACSJ0416.1-2403 (z = 0.396), that host one such steep spectrum RH and emphasize the important contribution of low frequency observations with interferometers like GMRT, MWA, LOFAR, SKA on cluster science and discovery of new population of rare steep spectrum RHs.
Description:	Open Access
URI:	http://hdl.handle.net/2289/6406
Alternative Location:	http://adsabs.harvard.edu/abs/2015sf2a.conf..247P http://sf2a.eu/proceedings/2015/2015sf2a.conf..0247P.pdf
Copyright:	2015 Société Française d’Astronomie et d’Astrophysique (SF2A),
Appears in Collections:	Research Papers (A&A)

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