The intracluster magnetic field in the double relic galaxy cluster Abell 2345

被引：33
作者：
Stuardi, C. [1 ,2 ]
Bonafede, A. [1 ,2 ]
Lovisari, L. [3 ,4 ]
Dominguez-Fernandez, P. [5 ]
Vazza, F. [1 ,2 ,5 ]
Brueggen, M. [5 ]
van Weeren, R. J. [6 ]
de Gasperin, F. [5 ]
机构：
[1] Univ Bologna, Dipartimento Fis & Astron, Via Gobetti 93-2, I-40129 Bologna, Italy
[2] INAF Ist Radioastron Bologna, Via Gobetti 101, I-40129 Bologna, Italy
[3] INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy
[4] Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
[5] Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
[6] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2021年 / 502卷 / 02期
基金：
欧洲研究理事会;
关键词：
magnetic fields; radiation mechanisms: non thermal; galaxies: clusters: individual: Abell 2345; LARGE-SCALE STRUCTURE; POWER SPECTRUM; FARADAY-ROTATION; RADIO-EMISSION; SKY SURVEY; SAMPLE; I; COLLABORATION; PROJECTION; TURBULENCE;
D O I：
10.1093/mnras/stab218
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Magnetic fields are ubiquitous in galaxy clusters, yet their radial profile, power spectrum, and connection to host cluster properties are poorly known. Merging galaxy clusters hosting diffuse polarized emission in the form of radio relics offer a unique possibility to study the magnetic fields in these complex systems. In this paper, we investigate the intracluster magnetic field in Abell 2345. This cluster hosts two radio relics that we detected in polarization with 1-2 GHz Jansky Very Large Array observations. X-ray XMM-Newton images show a very disturbed morphology. We derived the rotation measure (RM) of five polarized sources within similar to 1Mpc from the cluster centre applying the RMsynthesis. Both, the averageRMand the RMdispersion radial profiles probe the presence of intracluster magnetic fields. Using the thermal electron density profile derived from X-ray analysis and simulating a 3D magnetic field with fluctuations following a power spectrum derived frommagneto-hydrodynamical cosmological simulations, we build mock RM images of the cluster. We constrained the magnetic field profile in the eastern radio relic sector by comparing simulated and observed RM images. We find that, within the framework of our model, the data require a magnetic field scaling with thermal electron density as B(r) proportional to n(e)(r). The best model has a central magnetic field (within a 200 kpc radius) of 2.8 +/- 0.1 mu G. The average magnetic field at the position of the eastern relic is similar to 0.3 mu G, a factor 2.7 lower than the equipartition estimate.
引用
收藏
页码：2518 / 2535
页数：18
相关论文
共 79 条
[1]   Planck 2015 results XXVII. The second Planck catalogue of Sunyaev-Zeldovich sources [J].
Ade, P. A. R. ;
Aghanim, N. ;
Arnaud, M. ;
Ashdown, M. ;
Aumont, J. ;
Baccigalupi, C. ;
Banday, A. J. ;
Barreiro, R. B. ;
Barrena, R. ;
Bartlett, J. G. ;
Bartolo, N. ;
Battaner, E. ;
Battye, R. ;
Benabed, K. ;
Benoit, A. ;
Benoit-Levy, A. ;
Bernard, J. -P. ;
Bersanelli, M. ;
Bielewicz, P. ;
Bikmaev, I. ;
Boehringer, H. ;
Bonaldi, A. ;
Bonavera, L. ;
Bond, J. R. ;
Borrill, J. ;
Bouchet, F. R. ;
Bucher, M. ;
Burenin, R. ;
Burigana, C. ;
Butler, R. C. ;
Calabrese, E. ;
Cardoso, J. -F. ;
Carvalho, P. ;
Catalano, A. ;
Challinor, A. ;
Chamballu, A. ;
Chary, R. -R. ;
Chiang, H. C. ;
Chon, G. ;
Christensen, P. R. ;
Clements, D. L. ;
Colombi, S. ;
Colombo, L. P. L. ;
Combet, C. ;
Comis, B. ;
Couchot, F. ;
Coulais, A. ;
Crill, B. P. ;
Curto, A. ;
Cuttaia, F. .
ASTRONOMY & ASTROPHYSICS, 2016, 594
[2]   BROADBAND RADIO POLARIMETRY AND FARADAY ROTATION OF 563 EXTRAGALACTIC RADIO SOURCES [J].
Anderson, C. S. ;
Gaensler, B. M. ;
Feain, I. J. ;
Franzen, T. M. O. .
ASTROPHYSICAL JOURNAL, 2015, 815 (01)
[3]   THE 1% CONCORDANCE HUBBLE CONSTANT [J].
Bennett, C. L. ;
Larson, D. ;
Weiland, J. L. ;
Hinshaw, G. .
ASTROPHYSICAL JOURNAL, 2014, 794 (02)
[4]   WIDE-FIELD WIDE-BAND INTERFEROMETRIC IMAGING: THE WB A-PROJECTION AND HYBRID ALGORITHMS [J].
Bhatnagar, S. ;
Rau, U. ;
Golap, K. .
ASTROPHYSICAL JOURNAL, 2013, 770 (02)
[5]   The Cosmic Large-Scale Structure in X-rays (CLASSIX) Cluster Survey I. Probing galaxy cluster magnetic fields with line of sight rotation measures [J].
Boehringer, Hans ;
Chon, Gayoung ;
Kronberg, Philipp P. .
ASTRONOMY & ASTROPHYSICS, 2016, 596
[6]   Measurements and simulation of Faraday rotation across the Coma radio relic [J].
Bonafede, A. ;
Vazza, F. ;
Brueggen, M. ;
Murgia, M. ;
Govoni, F. ;
Feretti, L. ;
Giovannini, G. ;
Ogrean, G. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013, 433 (04) :3208-3226
[7]   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
[8]   Double relics in Abell 2345 and Abell 1240 Spectral index and polarization analysis [J].
Bonafede, A. ;
Giovannini, G. ;
Feretti, L. ;
Govoni, F. ;
Murgia, M. .
ASTRONOMY & ASTROPHYSICS, 2009, 494 (02) :429-442
[9]   The complex structure of Abell 2345: a galaxy cluster with non-symmetric radio relics [J].
Boschin, W. ;
Barrena, R. ;
Girardi, M. .
ASTRONOMY & ASTROPHYSICS, 2010, 521
[10]   Faraday rotation measure synthesis [J].
Brentjens, MA ;
de Bruyn, AG .
ASTRONOMY & ASTROPHYSICS, 2005, 441 (03) :1217-U100
12345678