Results 11 to 20 of about 298 (165)
Origin of galactic and extragalactic magnetic fields [PDF]
Reviews of Modern Physics, 2002 67 pages, 17 figures, accepted for publication in Reviews of Modern ...
Lawrence M Widrow
openaire +4 more sources
The redshift evolution of extragalactic magnetic fields
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACTFaraday rotation studies of distant radio sources can constrain the evolution and the origin of cosmic magnetism. We use data from the LOFAR Two-Metre Sky Survey: Data Release 2 (LoTSS DR2) to study the dependence of the Faraday rotation measure (RM) on redshift.
V P Pomakov +9 more
openaire +5 more sources
Lower bound on the local extragalactic magnetic field [PDF]
Physical Review D, 2001 Assuming that the hard gamma-ray emission of Cen A is a result of synchrotron radiation of ultra-relativistic electrons, we derive a lower bound on the local extragalactic magnetic field, $B> 10^{-8}$ G. This result is consistent with (and close to) upper bounds on magnetic fields derived from consideration of cosmic microwave background distortions
Anchordoqui, Luis A., Goldberg, Haim
openaire +2 more sources
Probing UHECR production in Centaurus A using secondary neutrinos and gamma-rays
European Physical Journal C: Particles and Fields, 2021 In this paper the production of neutrinos and photons by ultra high energy cosmic rays (UHECR) interacting with the extragalactic background radiation is studied.
Cainã de Oliveira, Vitor de Souza
doaj +1 more source
Core shifts, magnetic fields and magnetization of extragalactic jets [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 We study the effect of radio-jet core shift, which is a dependence of the position of the jet radio core on the observational frequency. We derive a new method of measuring the jet magnetic field based on both the value of the shift and the observed radio flux, which complements the standard method that assumes equipartition.
Zdziarski, Andrzej A. +3 more
openaire +2 more sources
Inflationary and Phase-transitional Primordial Magnetic Fields in Galaxy Clusters
The Astrophysical Journal, 2023 Primordial magnetic fields (PMFs) are possible candidates for explaining the observed magnetic fields in galaxy clusters. Two competing scenarios of primordial magnetogenesis have been discussed in the literature: inflationary and phase-transitional.
Salome Mtchedlidze +6 more
doaj +1 more source
Magnetogenesis in a Collisionless Plasma: From Weibel Instability to Turbulent Dynamo
The Astrophysical Journal, 2023 We report on a first-principles numerical and theoretical study of plasma dynamo in a fully kinetic framework. By applying an external mechanical force to an initially unmagnetized plasma, we develop a self-consistent treatment of the generation of “seed”
Muni Zhou +4 more
doaj +1 more source
Constraints on the Intergalactic Magnetic Field Using Fermi-LAT and H.E.S.S. Blazar Observations
The Astrophysical Journal Letters, 2023 Magnetic fields in galaxies and galaxy clusters are believed to be the result of the amplification of intergalactic seed fields during the formation of large-scale structures in the universe.
F. Aharonian +137 more
doaj +1 more source
Extragalactic jets with helical magnetic fields: relativistic MHD simulations [PDF]
Astronomy & Astrophysics, 2008 Extragalactic jets are inferred to harbor dynamically important, organized magnetic fields which presumably aid in the collimation of the relativistic jet flows. We here explore by means of grid-adaptive, high resolution numerical simulations the morphology of AGN jets pervaded by helical field and flow topologies.
Keppens, R. +3 more
openaire +5 more sources
EPJ Web of Conferences, 2013 Recently CRPropa 2.0 has been released as a public software package to simulate the extragalactic propagation of ultra-high energy nuclei. It includes deflections by extragalactic magnetic fields and all relevant interactions with ambient photon ...
Nierstenhoefer Nils +6 more
doaj +1 more source