A low-frequency radio halo survey of the South Pole Telescope SZ-selected clusters with the GMRT. Issue 2 (5th November 2020)

• Record Type: Journal Article
• Authors: Raja, Ramij; Rahaman, Majidul; Datta, Abhirup; van Weeren, Reinout J; Intema, Huib T; Paul, Surajit
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 500:Issue 2(2021)
• Page Start: 2236
• Page End: 2249
• Publication Date: 2020-11-05
• Subjects: radiation mechanisms: non-thermal -- galaxies: clusters: general -- galaxies: clusters: intracluster medium -- radio continuum: general; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa3432
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: The presence of non-thermal electrons and large-scale magnetic fields in the intracluster medium is known through the detection of megaparsec (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. This campaign has resulted in the discovery of two new radio haloes (SPT-CL J0013−4906 and SPT-CL J0304−4401) along with two 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 one cluster in our sample, and upper limits for haloes are placed in eight clusters where no diffuse emission is detected. In the P 1.4 – L X plane, the detected haloes follow the observed correlation, whereas the upper limits lie above the correlation line, indicating the possibility of future detection with sensitive observations.