Magnetic fields and relativistic electrons fill entire galaxy cluster

被引：37

作者：

Botteon, Andrea ^{[1
,2
,3
]}

van Weeren, Reinout J.

Brunetti, Gianfranco ^{[3
]}

Vazza, Franco ^{[2
,3
]}

Shimwell, Timothy W. ^{[1
,4
]}

Bruggen, Marcus ^{[5
]}

Rottgering, Huub J. A. ^{[1
]}

de Gasperin, Francesco ^{[3
]}

Akamatsu, Hiroki ^{[6
]}

Bonafede, Annalisa ^{[2
,3
]}

Cassano, Rossella ^{[3
]}

Cuciti, Virginia ^{[3
,5
]}

Dallacasa, Daniele ^{[2
,3
]}

Di Gennaro, Gabriella ^{[5
]}

Gastaldello, Fabio ^{[6
]}

机构：

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

[2] Univ Bologna, Dipartimento Fis Astron, Via P Gobetti 93 2, I-40129 Bologna, Italy

[3] INAF IRA, Via P Gobetti 101, I-40129 Bologna, Italy

[4] Netherlands Inst Radio Astron, ASTRON, NL-7990 Postbus, AA, Netherlands

[5] Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany

[6] SRON Netherlands Inst Space Res, Niels Bohrweg 4, Niels Bohrweg, CA 4 USA

来源：

SCIENCE ADVANCES | 2022年 / 8卷 / 44期

基金：

欧洲研究理事会;

关键词：

COSMIC-RAY ELECTRONS; PARTICLE-ACCELERATION; RADIO; EMISSION; CALIBRATION; MOTIONS; SHOCKS; WAVES;

D O I：

10.1126/sciadv.abq7623

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The hot plasma within merging galaxy clusters is predicted to be filled with shocks and turbulence that may convert part of their kinetic energy into relativistic electrons and magnetic fields generating synchrotron radiation. Analyzing Low Frequency Array (LOFAR) observations of the galaxy cluster Abell 2255, we show evidence of radio synchrotron emission distributed over very large scales of at least 5 megaparsec. The pervasive radio emission witnesses that shocks and turbulence efficiently transfer kinetic energy into relativistic particles and magnetic fields in a region that extends up to the cluster outskirts. The strength of the emission requires a magnetic field energy density at least 100 times higher than expected from a simple compression of primordial fields, presumably implying that dynamo operates efficiently also in the cluster periphery. It also suggests that nonthermal components may contribute substantially to the pressure of the intracluster medium in the cluster periphery.

引用

页数：8

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