Recent X-ray and Sunyaev-Zel'dovich (SZ) observations have dramatically increased the number of known distant galaxy clusters. In some merging, low-redshift (z < 0.4) clusters, centrally located, diffuse, extended radio emission (radio halos) has been found. Using the Giant Metrewave Radio Telescope (GMRT), we report the detection of diffuse radio emission in the binary-merging cluster PLCK G147.3-16.6 located at z = 0.65. We classify the emission as a giant radio halo due to its large physical extent of about 0.9 Mpc and its low-surface brightness. We measure an integrated flux density of 7.3 ± 1.1 mJy at 610 MHz for the radio halo, resulting in a 1.4 GHz radio power of 5.1 × 1024 W Hz-1. The radio halo power is consistent with that expected from the known correlation between X-ray luminosity or the cluster integrated SZ signal and radio power. Our observations also suggest that more of these distant radio halos could be discovered with the GMRT. © 2014. The American Astronomical Society. All rights reserved.
The discovery of a radio halo in PLCK G147.3-16.6 at Z = 0.65 / Van Weeren, R.J.; Intema, H.T.; Lal, D.V.; Bonafede, A.; Jones, C.; Forman, W.R.; Röttgering, H.J.A.; Brüggen, M.; Stroe, A.; Hoeft, M.; Nuza, S.E.; De Gasperin, F.. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - ELETTRONICO. - 781:2(2014), pp. L32 (5pp).L32-L32 (5pp).36. [10.1088/2041-8205/781/2/L32]
The discovery of a radio halo in PLCK G147.3-16.6 at Z = 0.65
Bonafede, A.;Jones, C.;Hoeft, M.;
2014
Abstract
Recent X-ray and Sunyaev-Zel'dovich (SZ) observations have dramatically increased the number of known distant galaxy clusters. In some merging, low-redshift (z < 0.4) clusters, centrally located, diffuse, extended radio emission (radio halos) has been found. Using the Giant Metrewave Radio Telescope (GMRT), we report the detection of diffuse radio emission in the binary-merging cluster PLCK G147.3-16.6 located at z = 0.65. We classify the emission as a giant radio halo due to its large physical extent of about 0.9 Mpc and its low-surface brightness. We measure an integrated flux density of 7.3 ± 1.1 mJy at 610 MHz for the radio halo, resulting in a 1.4 GHz radio power of 5.1 × 1024 W Hz-1. The radio halo power is consistent with that expected from the known correlation between X-ray luminosity or the cluster integrated SZ signal and radio power. Our observations also suggest that more of these distant radio halos could be discovered with the GMRT. © 2014. The American Astronomical Society. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
