Non-thermal emission from galaxy clusters: feasibility study with SKA1
Abstract
Galaxy clusters are known to host a variety of extended radio sources: tailed radio galaxies whose shape is modelled by the interaction with the intra-cluster medium (ICM); radio bubbles filling cavities in the ICM distribution and rising buoyantly through the thermal gas; diffuse giant radio sources ("halos" and "relics") revealing the presence of relativistic electrons and magnetic fields in the intra-cluster volume. It is currently the subject of an active debate how the non-thermal components that we observe at radio wavelengths affect the physical properties of the ICM and depend on the dynamical state of galaxy clusters. In this work we start our SKA1 feasibility study of the "radio cluster zoo" through simulations of a typical radio-loud cluster, hosting several bright tailed radio galaxies and a diffuse radio halo. Realistic simulations of SKA1 observations are obtained through the MeqTrees software. A new deconvolution algorithm, based on sparse representations and optimised for the detection of faint diffuse astronomical sources, is tested and compared to the classical CLEAN method.
Cite
@article{arxiv.1412.5801,
title = {Non-thermal emission from galaxy clusters: feasibility study with SKA1},
author = {Chiara Ferrari and Arwa Dabbech and Oleg Smirnov and Sphesihle Makhathini and Jonathan S. Kenyon and Matteo Murgia and Federica Govoni and David Mary and Eric Slezak and Franco Vazza and Annalisa Bonafede and Marcus Brueggen and Melanie Johnston-Hollitt and Siamak Dehghan and Luigina Feretti and Gabriele Giovannini and Valentina Vacca and Michael Wise and Myriam Gitti and Monique Arnaud and Gabriel W. Pratt and Kristian Zarb Adami and Sergio Colafrancesco},
journal= {arXiv preprint arXiv:1412.5801},
year = {2014}
}
Comments
12 pages, 5 figures, to appear as part of 'Continuum Science' in Proceedings 'Advancing Astrophysics with the SKA (AASKA14)'