A low-frequency radio halo associated with a cluster of galaxies

G. Brunetti (), S. Giacintucci, R. Cassano, W. Lane, D. Dallacasa, T. Venturi, N. E. Kassim, G. Setti, W. D. Cotton and M. Markevitch
Additional contact information
G. Brunetti: INAF - Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy
S. Giacintucci: INAF - Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy
R. Cassano: INAF - Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy
W. Lane: Naval Research Laboratory, Code 7213, Washington DC 20375-5320, USA
D. Dallacasa: Università di Bologna, Via Ranzani 1, I-40127 Bologna, Italy
T. Venturi: INAF - Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy
N. E. Kassim: Naval Research Laboratory, Code 7213, Washington DC 20375-5320, USA
G. Setti: INAF - Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy
W. D. Cotton: National Radio Astronomy Observatory, Charlottesville, Virginia 22903-2475, USA
M. Markevitch: Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA

Nature, 2008, vol. 455, issue 7215, 944-947

Abstract: Distant haloes in prospect The next generation of radio telescopes will enter what is virtually uncharted territory, observing the Universe at low radio frequencies with unprecedented resolution and sensitivity. A glimpse of what they might find is provided by the discovery of a new class of low frequency galaxy clusters. Deep observations with the Giant Metrewave Radio Telescope, located just north of Pune in India, reveal a radio halo at low frequencies associated with the merging cluster Abell 521. The halo has an extremely steep radio spectrum that makes it difficult to detect with observations at 1.4 GHz (the frequency at which all other known radio haloes have been studied). The spectrum supports a turbulent acceleration mechanism, which predicts that many radio haloes in the Universe should emit mainly at low frequencies.

Date: 2008
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DOI: 10.1038/nature07379

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