Simulating the transport of relativistic electrons and magnetic fields injected by radio galaxies in the intracluster medium

被引:34
|
作者
Vazza, F. [1 ,2 ,3 ]
Wittor, D. [1 ,2 ]
Brunetti, G. [3 ]
Bruggen, M. [2 ]
机构
[1] Univ Bologna, Dipartimento Fis & Astron, Via Gobetti 93-2, I-40122 Bologna, Italy
[2] Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
[3] INAF, Ist Radioastron, Via Gobetti 101, I-40122 Bologna, Italy
基金
欧盟地平线“2020”;
关键词
acceleration of particles; magnetohydrodynamics (MHD); radio continuum: general; methods: numerical; galaxies: clusters: intracluster medium; ACTIVE GALACTIC NUCLEI; COSMIC-RAY ELECTRONS; COSMOLOGICAL SIMULATIONS; AGN FEEDBACK; GAMMA-RAY; 3-DIMENSIONAL SIMULATIONS; PARTICLE-ACCELERATION; ENERGY-SPECTRUM; MHD SIMULATIONS; CLUSTER MEDIUM;
D O I
10.1051/0004-6361/202140513
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Radio galaxies play an important role in the seeding of cosmic rays and magnetic fields in galaxy clusters. Here, we simulate the evolution of relativistic electrons injected into the intracluster medium by radio galaxies. Using passive tracer particles added to magnetohydrodynamical adaptive-mesh simulations, we calculated the evolution of the spectrum of relativistic electrons, taking into account energy losses and re-acceleration mechanisms associated with the dynamics of the intracluster medium. Re-acceleration can occur at shocks via diffusive shock acceleration, and in turbulent flows via second-order Fermi re-acceleration. This study confirms that relativistic electrons from radio galaxies can efficiently fill the intracluster medium over scales of several hundreds of Myr and that they create a stable reservoir of fossil electrons that remains available for further re-acceleration by shock waves and turbulent gas motions. Our results also show that late evolution of radio lobes and remnant radio galaxies is significantly affected by the dynamics of the surrounding intracluster medium. Here, the diffusive re-acceleration couples the evolution of relativistic particles to the gas perturbations. In the near future, deep radio observations, especially at low frequencies, will be able to probe such mechanisms in galaxy clusters.
引用
收藏
页数:21
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