Radio observations of the merging galaxy cluster system Abell 3391-Abell 3395
Dec 16, 202016 pages
Published in:
- Astron.Astrophys. 647 (2021) A3
- Published: Mar 1, 2021
e-Print:
- 2012.08775 [astro-ph.HE]
DOI:
- 10.1051/0004-6361/202039533 (publication)
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Abstract: (EDP Sciences)
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 deg2 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.Key words: X-rays: galaxies: clusters / radio continuum: galaxies / galaxies: clusters: intracluster medium★ The ASKAP mosaic is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/647/A3Note:
- Astronomy & Astrophysics, in press
- X-rays: galaxies: clusters
- radio continuum: galaxies
- galaxies: clusters: intracluster medium
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