Discovery of a radio relic in the low mass, merging galaxy cluster PLCK G200.9-28.2

被引：18

作者：

Kale, Ruta ^{[1
]}

Wik, Daniel R. ^{[2
,3
,4
]}

Giacintucci, Simona ^{[5
]}

Venturi, Tiziana ^{[6
]}

Brunetti, Gianfranco ^{[6
]}

Cassano, Rossella ^{[6
]}

Dallacasa, Daniele ^{[7
]}

de Gasperin, Francesco ^{[8
]}

机构：

[1] Tata Inst Fundamental Res, Natl Ctr Radio Astrophys, Post Bag 3, Pune 411007, Maharashtra, India

[2] NASA, Goddard Space Flight Ctr, Code 662, Greenbelt, MD 20771 USA

[3] Johns Hopkins Univ, Homewood Campus, Baltimore, MD 21218 USA

[4] Univ Utah, Dept Phys & Astron, 115 South 1400 East, Salt Lake City, UT 84112 USA

[5] Naval Res Lab, 4555 Overlook Ave SW,Code 7213, Washington, DC 20375 USA

[6] INAF Ist Radioastron, Via Gobetti 101, I-40129 Bologna, Italy

[7] Univ Bologna, Dipartimento Fis & Astron, Via Ranzani 1, I-40127 Bologna, Italy

[8] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 472卷 / 01期

基金：

美国国家航空航天局;

关键词：

radiation mechanisms: non-thermal; shock waves; galaxies: clusters: individual: PLCKG200.9-28.2; galaxies: clusters: intracluster medium; radio continuum: general; X-rays: galaxies: clusters; PARTICLE-ACCELERATION; LOW-FREQUENCY; SHOCK; HALO; EFFICIENCY;

D O I：

10.1093/mnras/stx2031

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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, M-500 = 2.7 +/- 0.2 x 10(14)M(circle dot)) 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 similar to 1 x 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 610MHz 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.

引用

页码：940 / 948

页数：9

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