A low-frequency radio halo survey of the South Pole Telescope SZ-selected clusters with the GMRT

Abstract

The presence of non-thermal electrons and large scale magnetic fields in the intra-cluster medium (ICM) is known through the detection of mega-parsec (Mpc) scale diffuse radio synchrotron emission. Although a significant amount of progress in finding new diffuse radio sources has happened in the last decade, most of the investigation has been constrained towards massive low-redshift clusters. In this work, we explore clusters with redshift $z>0.3$ in search of diffuse radio emission, at 325 MHz with the Giant Metrewave Radio Telescope (GMRT). This campaign has resulted in the discovery of 2 new radio halos (SPT-CL J0013-4906 and SPT-CL J0304-4401) along with 2 other detections (SPT-CL J2031-4037 and SPT-CL J2248-4431), previously reported (at 325 MHz) in the literature. In addition, we detect a halo candidate in 1 cluster in our sample, and upper limits for halos are placed in 8 clusters where no diffuse emission is detected. In the $P_{1.4}-L_{\mathrm{X}}$ plane, the detected halos follow the observed correlation, whereas the upper limits lie above the correlation line, indicating the possibility of future detection with sensitive observations.

15 pages, 10 figures; Accepted for publication in MNRAS

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• MeerKAT's View of the Bullet Cluster 1E 0657-55.8
• Exploring diffuse radio emission in galaxy clusters and groups with the uGMRT and the SKA
• Radio Halo Detection in MWA Data using Deep Neural Networks and Generative Data Augmentation