Details

Autor(en) / Beteiligte

• Brüggen, M.
• Reiprich, T. H.
• Bulbul, E.
• Koribalski, B. S.
• Andernach, H.
• Rudnick, L.
• Hoang, D. N.
• Wilber, A. G.
• Duchesne, S. W.
• Veronica, A.
• Pacaud, F.
• Hopkins, A. M.
• Norris, R. P.
• Johnston-Hollitt, M.
• Brown, M. J. I.
• Bonafede, A.
• Brunetti, G.
• Collier, J. D.
• Sanders, J. S.
• Vardoulaki, E.
• Venturi, T.
• Kapinska, A. D.
• Marvil, J.

Titel

Radio observations of the merging galaxy cluster system Abell 3391-Abell 3395

Ist Teil von

• Astronomy and astrophysics (Berlin), 2021-03, Vol.647, p.A3

Ort / Verlag

Heidelberg: EDP Sciences

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The pre-merging system of galaxy clusters Abell 3391-Abell 3395 located at a mean redshift of 0.053 has been observed at 1 GHz in an ASKAP/EMU Early Science observation as well as in X-rays with eROSITA. The projected separation of the X-ray peaks of the two clusters is ~50′ or ~3.1 Mpc. Here we present an inventory of interesting radio sources in this field around this cluster merger. While the eROSITA observations provide clear indications of a bridge of thermal gas between the clusters, neither ASKAP nor MWA observations show any diffuse radio emission coinciding with the X-ray bridge. We derive an upper limit on the radio emissivity in the bridge region of 〈 J 〉 1 GHz < 1.2 × 10 −44 W Hz −1 m −3 . A non-detection of diffuse radio emission in the X-ray bridge between these two clusters has implications for particle-acceleration mechanisms in cosmological large-scale structure. We also report extended or otherwise noteworthy radio sources in the 30 deg 2 field around Abell 3391-Abell 3395. We identified 20 Giant Radio Galaxies, plus 7 candidates, with linear projected sizes greater than 1 Mpc. The sky density of field radio galaxies with largest linear sizes of >0.7 Mpc is ≈1.7 deg −2 , three times higher than previously reported. We find no evidence for a cosmological evolution of the population of Giant Radio Galaxies. Moreover, we find seven candidates for cluster radio relics and radio halos.