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

• Main Authors: Raja, Ramij, Rahaman, Majidul, Datta, Abhirup, van Weeren, Reinout J., Intema, Huib T., Paul, Surajit
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: arXiv 2020
• Subjects: High Energy Astrophysical Phenomena astro-ph.HE; FOS Physical sciences; South Pole; South pole
• Online Access: https://dx.doi.org/10.48550/arxiv.2011.01652; https://arxiv.org/abs/2011.01652

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