Abstract
We present radio observations of the galaxy cluster PLCK G004.5-19.5 ($z=0.52$) using the Giant Metrewave Radio Telescope at 150~MHz, 325~MHz, and 610~MHz. We find an unusual arrangement of diffuse radio emission in the center and periphery of the cluster, as well as several radio galaxies with head-tail emission. A patch of peripheral emission resembles a radio relic, and central emission resembles a radio halo. Reanalysis of archival XMM-Newton X-ray data shows that PLCK G004.5-19.5 is disturbed, which has a known correlation with the existence of radio relics and halos. Given that the number of known radio halos and radio relics at $z>0.5$ is very limited, PLCK G004.5-19.5 is an important addition to understanding merger-related particle acceleration at higher redshifts.
Highlights
Galaxy clusters are the most massive gravitationally bound structures in the Universe with masses and volumes of the order of 1014−15 M and 100 Mpc3
We present galaxy cluster PLCK G004.5-19.5, which lies at a redshift (z = 0.516) with few known radio relics and halos; this makes it a tantalizing target to search for diffuse emission
We found a complex arrangement of central and peripheral diffuse emission, as well as several head-tail galaxies
Summary
Galaxy clusters are the most massive gravitationally bound structures in the Universe with masses and volumes of the order of 1014−15 M and 100 Mpc. We present galaxy cluster PLCK G004.5-19.5, which lies at a redshift (z = 0.516) with few known radio relics and halos; this makes it a tantalizing target to search for diffuse emission. It was discovered by the Planck satellite through the. In this paper we offer new high-resolution 150 MHz, 325 MHz, and 610 MHz observations of the cluster PLCK G004.5-19.5 using the Giant Metrewave Radio Telescope (GMRT), and a reanalysis of XMM-Newton data for a morphology study of the X-ray emission.
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