Tracing low-mass galaxy clusters using radio relics: The discovery of Abell 3527-bis
MetadataShow full item record
Reproduced with permission from Astronomy & Astrophysics, © ESO
Context. Galaxy clusters undergo mergers that can generate extended radio sources called radio relics. Radio relics are the consequence of merger-induced shocks that propagate in the intra cluster medium (ICM). Aims. In this paper we analyse the radio, optical and X-ray data from a candidate galaxy cluster that has been selected from the radio emission coming from a candidate radio relic detected in NRAO VLA Sky Survey (NVSS). Our aim is to clarify the nature of this source and prove that under certain conditions radio emission from radio relics can be used to trace relatively low-mass galaxy clusters. Methods. We observed the candidate galaxy cluster with the Giant Meterwave Radio Telescope (GMRT) at three different frequencies. These datasets have been analysed together with archival data from ROSAT in the X-ray and with archival data from the Gamma-Ray Burst Optical/Near-Infrared Detector (GROND) telescope in four different optical bands. Results. We confirm the presence of a 1 Mpc long radio relic located in the outskirts of a previously unknown galaxy cluster. We confirm the presence of the galaxy cluster through dedicated optical observations and using archival X-ray data. Due to its proximity and similar redshift to a known Abell cluster, we named it Abell 3527-bis. The galaxy cluster is amongst the least massive clusters known to host a radio relic. Conclusions. We showed that radio relics can be effectively used to trace a subset of relatively low-mass galaxy clusters that might have gone undetected in X-ray or Sunyaev-Zel'dovich (SZ) surveys. This technique might be used in future deep, low-frequency surveys such as those carried on by the Low Frequency Array (LOFAR), the Upgraded GMRT (uGMRT) and, ultimately, the Square Kilometre Array (SKA).
Showing items related by title, author, creator and subject.
Randall, S.; Clarke, T.; Van Weeren, R.; Intema, Hubertus; Dawson, W.; Mroczkowski, T.; Blanton, E.; Bulbul, E.; Giacintucci, S. (2016)We present results based on X-ray, optical, and radio observations of the massive galaxy cluster CIZA J0107.7+5408. We find that this system is a post-core-passage, dissociative, binary merger, with the optical galaxy ...
Deep Very Large Array Observations of the Merging Cluster CIZA J2242.8+5301: Continuum and Spectral ImagingGennaro, G.; Van Weeren, R.; Hoeft, M.; Kang, H.; Ryu, D.; Rudnick, L.; Forman, W.; Röttgering, H.; Brüggen, M.; Dawson, W.; Golovich, N.; Hoang, D.; Intema, Hubertus; Jones, C.; Kraft, R.; Shimwell, T.; Stroe, A. (2018)Despite the progress that has been made in understanding radio relics, there are still open questions regarding the underlying particle acceleration mechanisms. In this paper, we present deep 1-4 GHz Very Large Array (VLA) ...
Bîrzan, L.; Rafferty, D.A.; Cassano, R.; Brunetti, G.; Weeren, RJ van; Brüggen, M.; Intema, Huib ; Gasperin, F de; Andrade-Santos, F.; Botteon, A.; Röttgering, H.J.A.; Shimwell, T.W.The largest galaxy clusters are observed still to be forming through major cluster-cluster mergers, often showing observational signatures such as radio relics and giant radio haloes. Using LOFAR Two-meter Sky Survey data, ...