Shock acceleration efficiency in radio relics

被引：105

作者：

Botteon, A. ^{[1
,2
,3
]}

Brunetti, G. ^{[2
]}

Ryu, D. ^{[4
]}

Roh, S. ^{[4
]}

机构：

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

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

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

[4] UNIST, Dept Phys, Sch Nat Sci, Ulsan 44919, South Korea

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 634卷

关键词：

acceleration of particles; radiation mechanisms; non-thermal; thermal; galaxies; clusters; intracluster medium; general; shock waves; PARTICLE-ACCELERATION; GALAXY CLUSTERS; BULLET CLUSTER; ABELL; 3376; EMISSION; HALO; ORIGIN; TELESCOPE; ELECTRON; FRONTS;

D O I：

10.1051/0004-6361/201936216

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Radio relics in galaxy clusters are giant diffuse synchrotron sources powered in cluster outskirts by merger shocks. Although the relic-shock connection has been consolidated in recent years by a number of observations, the details of the mechanisms leading to the formation of relativistic particles in this environment are still not well understood. Aims. The diffusive shock acceleration (DSA) theory is a commonly adopted scenario to explain the origin of cosmic rays at astrophysical shocks, including those in radio relics in galaxy clusters. However, in a few specific cases it has been shown that the energy dissipated by cluster shocks is not enough to reproduce the luminosity of the relics via DSA of thermal particles. Studies based on samples of radio relics are required to further address this limitation of the mechanism. Methods. In this paper, we focus on ten well-studied radio relics with underlying shocks observed in the X-rays and calculate the electron acceleration efficiency of these shocks that is necessary to reproduce the observed radio luminosity of the relics. Results. We find that in general the standard DSA cannot explain the origin of the relics if electrons are accelerated from the thermal pool with an efficiency significantly smaller than 10%. Our results show that other mechanisms, such as shock re-acceleration of supra-thermal seed electrons or a modification of standard DSA, are required to explain the formation of radio relics.

引用

页数：12

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