Radio haloes in Sunyaev-Zel'dovich-selected clusters of galaxies: the making of a halo?

被引：23

作者：

Bonafede, A. ^{[1
]}

Intema, H. ^{[2
]}

Brueggen, M. ^{[1
]}

Vazza, F. ^{[1
]}

Basu, K. ^{[3
]}

Sommer, M. ^{[3
]}

Ebeling, H. ^{[4
]}

de Gasperin, F. ^{[1
]}

Roettgering, H. J. A. ^{[5
]}

van Weeren, R. J. ^{[6
]}

Cassano, R. ^{[7
]}

机构：

[1] Univ Hamburg, Hamburger Sternwarte, D-21029 Hamburg, Germany

[2] Natl Radio Astron Observ, Socorro, NM 87801 USA

[3] Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany

[4] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[5] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[7] INAF IRA, I-40129 Bologna, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 454卷 / 04期

基金：

美国国家航空航天局;

关键词：

acceleration of particles; radiation mechanisms: non-thermal; galaxies: clusters: individual: Abell 1443; galaxies: clusters: individual: CIZAJ1938.3+5409; galaxies: clusters: individual: RXCJ0949.9+1708; galaxies: clusters: individual: RXCJ1354.6+7715; COSMIC-RAY PROTONS; VLA SKY SURVEY; SCALING RELATIONS; MAGNETIC-FIELD; GAMMA-RAY; NONTHERMAL EMISSION; ROTATION MEASURES; COMA CLUSTER; SAMPLE; ACCELERATION;

D O I：

10.1093/mnras/stv2065

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Radio haloes are synchrotron radio sources detected in some massive galaxy clusters. Their size of Mpc indicates that (re)acceleration processes are taking place in the host cluster. X-ray catalogues of galaxy clusters have been used in the past to search for radio haloes and to understand their connection with cluster-cluster mergers and with the thermal component of the intracluster medium. More recently, the Sunyaev-Zel'dovich effect has been proven to be a better route to search for massive clusters in a wider redshift range. With the aim of discovering new radio haloes and understanding their connection with cluster-cluster mergers, we have selected the most massive clusters from the Planck early source catalogue and we have observed with the Giant Metrewave Radio Telescope at 323 MHz those objects for which deep observations were not available. We have discovered new peculiar radio emission in three of the observed clusters, finding (i) a radio halo in the cluster RXCJ0949.8+1708, (ii) extended emission in Abell 1443 that we classify as a radio halo plus a radio relic, with a bright filament embedded in the radio halo, and (iii) low-power radio emission in CIZA J1938.3+5409 that is ten times below the radio-X-ray correlation and represents the first direct detection of the radio emission in the 'upper-limit' region of the radio-X-ray diagram. We discuss the properties of these new radio haloes in the framework of theoretical models for the radio emission.

引用

页码：3391 / 3402

页数：12

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