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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27342
Title: Discovery of a radio relic in the low mass, merging galaxy cluster PLCK G200.9-28.2
Authors: Kale, Ruta
Wik, Daniel R.
Giacintucci, Simona
VENTURI, Tiziana 
BRUNETTI, GIANFRANCO 
CASSANO, Rossella
Dallacasa, Daniele 
DE GASPERIN, FRANCESCO
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Abstract: Radio relics at the peripheries of galaxy clusters are tracers of the elusive cluster merger shocks. We report the discovery of a single radio relic in the galaxy cluster PLCK G200.9-28.2 (z = 0.22, M500 = 2.7 ± 0.2 × 1014 M☉) using the Giant Metrewave Radio Telescope at 235 and 610 MHz and the Karl G. Jansky Very Large Array at 1500 MHz. The relic has a size of ∼1 × 0.28 Mpc, an arc-like morphology and is located at 0.9 Mpc from the X-ray brightness peak in the cluster. The integrated spectral index of the relic is 1.21 ± 0.15. The spectral index map between 235 and 610 MHz shows steepening from the outer to the inner edge of the relic in line with the expectation from a cluster merger shock. Under the assumption of diffusive shock acceleration, the radio spectral index implies a Mach number of 3.3 ± 1.8 for the shock. The analysis of archival XMM-Newton data shows that PLCK G200.9-28.2 consists of a northern brighter sub-cluster, and a southern sub-cluster in a state of merger. This cluster has the lowest mass amongst the clusters hosting single radio relics. The position of the Planck Sunyaev-Ze'ldovich effect in this cluster is offset by 700 kpc from the X-ray peak in the direction of the radio relic, suggests a physical origin for the offset. Such large offsets in low mass clusters can be a useful tool to select disturbed clusters and to study the state of merger.
URI: http://hdl.handle.net/20.500.12386/27342
URL: https://academic.oup.com/mnras/article-abstract/472/1/940/4082089?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnras/stx2031
Bibcode ADS: 2017MNRAS.472..940K
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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