MAGNETOHYDRODYNAMIC TURBULENCE AND COSMIC-RAY REACCELERATION IN GALAXY CLUSTERS

被引：23

作者：

Beresnyak, Andrey ^{[1
,2
]}

Xu, Hao ^{[1
,3
]}

Li, Hui ^{[1
]}

Schlickeiser, Reinhard ^{[2
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Ruhr Univ Bochum, D-44780 Bochum, Germany

[3] Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 771卷 / 02期

基金：

美国国家科学基金会;

关键词：

acceleration of particles; galaxies: clusters: intracluster medium; turbulence; INTERGALACTIC MAGNETIC-FIELD; DIFFUSE RADIO-EMISSION; COMA CLUSTER; COSMOLOGICAL SIMULATIONS; PARTICLE REACCELERATION; COMPRESSIBLE TURBULENCE; INTERSTELLAR TURBULENCE; NONTHERMAL EMISSION; FERMI OBSERVATIONS; SCALING RELATIONS;

D O I：

10.1088/0004-637X/771/2/131

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cosmological MHD simulations of galaxy cluster formation show a significant amplification of seed magnetic fields. We developed a novel method to decompose cluster magnetized turbulence into modes and showed that the fraction of the fast mode is fairly large, around one-fourth in terms of energy. This is larger than that was estimated before, which implies that cluster turbulence interacts with cosmic rays rather efficiently. We propose a framework to deal with electron and proton reacceleration in galaxy clusters that includes feedback on turbulence. In particular, we establish a new upper limit on proton and electron fluxes based on turbulence intensity. These findings, along with detailed modeling of reacceleration, will help to reconcile the observed giant radio halos and the unobserved diffuse gamma-ray emission from these clusters.

引用

页数：8

共 79 条

[1] GeV GAMMA-RAY FLUX UPPER LIMITS FROM CLUSTERS OF GALAXIES [J].

Ackermann, M. ;

Ajello, M. ;

Allafort, A. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Blandford, R. D. ;

Blasi, P. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Brandt, T. J. ;

Bregeon, J. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Cecchi, C. ;

Celik, Oe ;

Charles, E. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Colafrancesco, S. ;

Cominsky, L. R. ;

Conrad, J. ;

Dermer, C. D. ;

de Palma, F. ;

Silva, E. do Couto e ;

Drell, P. S. ;

Dubois, R. ;

Dumora, D. ;

Edmonds, Y. ;

Farnier, C. ;

Favuzzi, C. ;

Frailis, M. ;

Fukazawa, Y. .

ASTROPHYSICAL JOURNAL LETTERS, 2010, 717 (01) :L71-L78

[2] Universal Nonlinear Small-Scale Dynamo [J].

Beresnyak, A. .

PHYSICAL REVIEW LETTERS, 2012, 108 (03)

[3] Spectral Slope and Kolmogorov Constant of MHD Turbulence [J].

Beresnyak, A. .

PHYSICAL REVIEW LETTERS, 2011, 106 (07)

[4] TURBULENCE-INDUCED MAGNETIC FIELDS AND STRUCTURE OF COSMIC RAY MODIFIED SHOCKS [J].

Beresnyak, A. ;

Jones, T. W. ;

Lazarian, A. .

ASTROPHYSICAL JOURNAL, 2009, 707 (02) :1541-1549

[5] The Coma cluster magnetic field from Faraday rotation measures [J].

Bonafede, A. ;

Feretti, L. ;

Murgia, M. ;

Govoni, F. ;

Giovannini, G. ;

Dallacasa, D. ;

Dolag, K. ;

Taylor, G. B. .

ASTRONOMY & ASTROPHYSICS, 2010, 513

[6]

Borgani S., 2009, ASL, V4, P204

[7] THE COSMOLOGICAL IMPACT OF LUMINOUS TeV BLAZARS. I. IMPLICATIONS OF PLASMA INSTABILITIES FOR THE INTERGALACTIC MAGNETIC FIELD AND EXTRAGALACTIC GAMMA-RAY BACKGROUND [J].

Broderick, Avery E. ;

Chang, Philip ;

Pfrommer, Christoph .

ASTROPHYSICAL JOURNAL, 2012, 752 (01)

[8] A low-frequency radio halo associated with a cluster of galaxies [J].

Brunetti, G. ;

Giacintucci, S. ;

Cassano, R. ;

Lane, W. ;

Dallacasa, D. ;

Venturi, T. ;

Kassim, N. E. ;

Setti, G. ;

Cotton, W. D. ;

Markevitch, M. .

NATURE, 2008, 455 (7215) :944-947

[9]

Brunetti G, 2007, MON NOT R ASTRON SOC, V378, P245, DOI 10.1111/j.1356-2966.2007.11771.x

[10] Particle reacceleration in the Coma cluster: radio properties and hard X-ray emission [J].

Brunetti, G ;

Setti, G ;

Feretti, L ;

Giovannini, G .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2001, 320 (03) :365-378

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