Tracing the ICM with extended radio emission

T. E. Clarke1*, T. Mroczkowski2, S. W. Randall3, S. Giacintucci4, H. Intema5, C. L. Sarazin6 and E. L. Blanton7
1Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC, USA
2NRC Postdoc at Naval Research Laboratory, Washington, DC, USA
3Center for Astrophysics, 60 Garden St., Cambridge, MA, USA
4University of Maryland, College Park, MD, USA
5National Radio Astronomy Observatory, Socorro, NM, USA
6University of Virginia, Charlottesville, VA, USA
7Boston University, Boston, MA, USA

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Abstract

Diffuse radio emission permeating galaxy clusters reveals the widespread presence of relativistic particles and magnetic fields in the intracluster medium (ICM).We present low frequency radio (VLA and GMRT) and X-ray (Chandra) data on the unusual radio emission in the ultra-steep spectrum (USS) relic cluster Abell 2443, as well as in Abell 2626 which contains a unique steep-spectrum diamond-shaped radio structure surrounding the core.

The USS source in Abell 2443 is likely an adiabatically compressed radio relic. Deep Chandra observation reveal the presence of two surface brightness edges while our new GMRT observations provide details of the complex morphology and spectral properties of the radio relic. GMRT observations of Abell 2626 reveal the presence of a previously unknown fourth radio arc completing the unique diamond-shape radio region that surrounds the cluster-center.



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Keywords : galaxy clusters – clusters individual: A2443, A2626 – X-ray