Turbulence is ubiquitous in many astrophysical systems like galaxies, galaxy clusters and possibly even the IGM filaments. We study fluctuation dynamo action in turbulent systems focusing on one observational signature; the Faraday rotation measure (RM) from background radio sources seen through the magnetic field generated by such a dynamo. We simulate the fluctuation dynamo (FD) in periodic boxes up to resolutions of 512^3, with varying fluid and magnetic Reynolds numbers, and measure the resulting random RMs. We show that, even though the magnetic field generated is intermittent, it still allows for contributions to the RM to be significant. When the dynamo saturates, it is of order 40%-50% of the value expected in a model where fields of strength B_rms uniformly fill cells of the largest turbulent eddy but are randomly oriented from one cell to another. This level of RM dispersion obtains across different values of magnetic Reynolds number and Prandtl number explored. We also use the random RMs to probe the structure of the generated fields to distinguish the contribution from intense and diffuse field regions. We find that the strong field regions (say with B > 2B_rms) contribute only of order 15%-20% to the RM. Thus rare structures do not dominate the RM; rather the general 'sea' of volume filling fluctuating fields are the dominant contributors. We also show that the magnetic integral scale, L_{int}, which is directly related to the RM dispersion, increases in all the runs, as Lorentz forces become important to saturate the dynamo. It appears that due to the ordering effect of the Lorentz forces, L_{int} of the saturated field tends to a modest fraction, 1/2-1/3 of the integral scale of the velocity field, for all our runs. These results are then applied to discuss the RM signatures of FD generated fields in young galaxies, galaxy clusters and intergalactic filaments.
Monitoring the power spectrum of magnetic field fluctuations across the simulated intracluster medium
Alma Mater Studiorum – Università di Bologna（博洛尼亚大学）；INAF, Osservatorio di Astrofisica e Scienza dello Spazio（意大利国家天体物理研究所天文与空间科学观测站）；INFN, Sezione di Bologna（意大利国家核物理研究所博洛尼部分部）；INAF - IRA（意大利国家天体物理研究所射电天文学研究所）；Universidad Nacional Autónoma de México（墨西哥国立自治大学）；Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México（墨西哥国立自治大学核科学研究所）
Magnetic field spreading from stellar and galactic dynamos into the exterior
Nordita, KTH Royal Institute of Technology and Stockholm University（诺迪塔，皇家理工学院和斯德哥尔摩大学）；The Oskar Klein Centre, Department of Astronomy, Stockholm University（奥斯卡·克莱因中心，天文学系，斯德哥尔摩大学）；McWilliams Center for Cosmology & Department of Physics, Carnegie Mellon University（麦克威廉斯宇宙学中心与物理系，卡内基梅隆大学）；School of Natural Sciences and Medicine, Ilia State University（自然科学与医学院，伊利亚州立大学）；Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University（宇宙粒子物理学奥斯卡·克莱因中心，物理系，斯德哥尔摩大学）；Dipartimento di Fisica e Astronomia, Universita di Bologna（物理与天文系，博洛尼亚大学）；INAF Istituto di Radioastronomia（意大利国家天体物理研究所射电天文台）；Université Paris Cité, CNRS, Astroparticule et Cosmologie（巴黎西岱大学，法国国家科学研究中心，亚原子物理与宇宙学）；Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne（天体物理学实验室，洛桑联邦理工学院）
Inferring magnetic field strengths in high-redshift lensing galaxies from Faraday rotation measure observations
Universität Heidelberg（海德堡大学）；Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）；Max-Planck-Institut für Radioastronomie（马克斯·普朗克射电天文研究所）；Max-Planck-Institut für Astrophysik（马克斯·普朗克天体物理研究所）
The PICO-Cluster Project: presenting the galaxy cluster sample and studying magnetic field growth, Faraday rotation and Braginskii heating
Niels Bohr Institute, University of Copenhagen（尼尔斯·玻尔学院，哥本哈根大学）；Leibniz-Institut für Astrophysik Potsdam (AIP)（波茨坦莱布尼茨天体物理研究所）；Max-Planck Institute for Astrophysics（马克斯·普朗克天体物理研究所）
Imprints of primordial magnetic fields in gravitational collapse during early structure formation
Carnegie Mellon University（卡内基梅隆大学）；Ilia State University（伊利亚国立大学）；Universit\'a di Bologna（博洛尼亚大学）；INAF Istituto di Radioastronomia（意大利国家天体物理研究所射电天文台）；Georgian National Astrophysical Observatory（格鲁吉亚国家天文台）
