VACCA, VALENTINAVALENTINAVACCAGOVONI, FEDERICAFEDERICAGOVONIPerley, Richard A.Richard A.PerleyMURGIA, MATTEOMATTEOMURGIACARRETTI, ETTOREETTORECARRETTILOI, FRANCESCAFRANCESCALOIFERETTI, LUIGINALUIGINAFERETTIGiovannini, GabrieleGabrieleGiovannini2022-06-142022-06-1420212075-4434http://hdl.handle.net/20.500.12386/32299The 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.ELETTRONICOenArticle10.3390/galaxies90401122-s2.0-85120777008https://www.mdpi.com/2075-4434/9/4/112https://api.elsevier.com/content/abstract/scopus_id/851207770082021Galax...9..112VFIS/05 - ASTRONOMIA E ASTROFISICA