Fast growth of magnetic fields in galaxy clusters: a self-accelerating dynamo
نویسندگان
چکیده
منابع مشابه
Fast growth of magnetic fields in galaxy clusters: a self-accelerating dynamo
We propose a model of magnetic-field growth in galaxy clusters whereby the field is amplified by a factor of about 10 8 over a cosmologically short time of ∼ 10 yr. Our model is based on the idea that the viscosity of the intracluster medium during the field-amplification epoch is determined not by particle collisions but by plasma microinstabilities: these give rise to small-scale fluctuations...
متن کاملMagnetic Fields in Galaxy Clusters
Magnetic fields in galaxy clusters can be investigated using a variety of techniques. Recent studies including radio halos, Inverse Compton hard X-ray emissions and Faraday rotation measure, are briefly outlined. A numerical approach for investigating cluster magnetic fields strength and structure is presented. It consists of producing simulated rotation measure, radio halo images, and radio ha...
متن کاملThe Evolution of Magnetic Fields in Galaxy Clusters
Cosmological simulations of magnetic fields in galaxy clusters show that remarkable agreement between simulations and observations of Faraday rotation and radio haloes can be achieved assuming that seed fields of ∼ 10−9 G were present at redshifts ∼ 15–20. The structure of the seed field is irrelevant for the final intracluster field. On average, the field grows exponentially with decreasing cl...
متن کاملSPH simulations of magnetic fields in galaxy clusters
We perform cosmological, hydrodynamic simulations of magnetic fields in galaxy clusters. The computational code combines the special-purpose hardware Grape for calculating gravitational interaction, and smooth-particle hydrodynamics for the gas component. We employ the usual MHD equations for the evolution of the magnetic field in an ideally conducting plasma. As a first application, we focus o...
متن کاملEvolution and structure of magnetic fields in simulated galaxy clusters
We use cosmological magneto-hydrodynamic simulations to study the evolution of magnetic fields in galaxy clusters in two different cosmological models, a standard-CDM and a Λ-CDM model. We show that the magnetic field strength profiles closely follow the cluster density profiles outside a core region of radius ∼ 200h kpc. The magnetic field has a correlation length of order 50h kpc and reverses...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 2006
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.200610600