Spectral Index of the Filaments in the Abell 523 Radio Halo

The galaxy cluster Abell 523 hosts a radio halo characterized by the presence of two filaments transversely located with respect to the cluster merger axis. In this paper, we present a spectral index image of these filaments between 1.410 and 1.782 GHz obtained with Jansky Very Large Array observati...

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Bibliographic Details
Published in:	Galaxies Vol. 9; no. 4; p. 112
Main Authors:	Vacca, Valentina, Govoni, Federica, Perley, Richard A., Murgia, Matteo, Carretti, Ettore, Loi, Francesca, Feretti, Luigina, Giovannini, Gabriele
Format:	Journal Article
Language:	English
Published:	Basel MDPI AG 01-12-2021
Subjects:	Clusters diffuse radio sources Filaments Galaxies galaxy clusters next generation radio telescopes radio galaxies Spectra Stars & galaxies
Online Access:	Get full text
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Summary:	The galaxy cluster Abell 523 hosts a radio halo characterized by the presence of two filaments transversely located with respect to the cluster merger axis. In this paper, we present a spectral index image of these filaments between 1.410 and 1.782 GHz obtained with Jansky Very Large Array observations. We find a steepening of the spectral index of the filaments at frequencies ≳1.4 GHz and an indication that bright patches are characterized by flat spectral indices. Our results are consistent with a scenario of highly-efficient turbulence induced by merger phenomena.
ISSN:	2075-4434 2075-4434
DOI:	10.3390/galaxies9040112