Discovery of extended Faraday rotation compatible with spiral structure in an intervening galaxy at Z = 0.395 - New observations of PKS 1229 - 021

Kronberg, P. P.; Perry, J. J.; Zukowski, Edwin L. H.

doi:10.1086/171104

Cited by 154 publications

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“…eral examples of such silhouettes have already been identified in the literature (e.g., Kronberg, Perry & Zukowski 1992;Johnson, Leahy & Garrington 1995). With the SKA, observations of high resolution and sensitivity can identify many such sources, at a range of redshifts.…”

Section: Polarisation Silhouettesmentioning

confidence: 92%

The Square Kilometre Array: a new probe of cosmic magnetism

Gaensler

2006

Astron Nachr

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Magnetic fields are a fundamental part of many astrophysical phenomena, but the evolution, structure and origin of magnetic fields are still unresolved problems in physics and astrophysics. When and how were the first fields generated? Are present-day magnetic fields the result of standard dynamo action, or do they represent rapid or recent field amplification through other processes? What role do magnetic fields play in turbulence, cosmic ray acceleration and structure formation? I explain how the Square Kilometre Array (SKA), a next-generation radio telescope, can deliver stunning new data-sets that will address these currently unanswered issues. The foundation for these experiments will be an all-sky survey of rotation measures, in which Faraday rotation toward > 10 7 background sources will provide a dense grid for probing magnetism in the Milky Way, nearby galaxies, and in distant galaxies, clusters and protogalaxies. Using these data, we can map out the evolution of magnetized structures from redshifts z > 3 to the present, can distinguish between different origins for seed magnetic fields in galaxies, and can develop a detailed model of the magnetic field geometry of the intergalactic medium and of the overall Universe. In addition, the SKA will certainly discover new magnetic phenomena beyond what we can currently predict or imagine.

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Section: Polarisation Silhouettesmentioning

confidence: 92%

The Square Kilometre Array: a new probe of cosmic magnetism

Gaensler

2006

Astron Nachr

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“…Although it seems unlikely to survive an epoch of inflation, it is conceivable that large-scale magnetic fields and magnetic inhomogeneities could be generated at the end of that era or in subsequent phase transitions [9]. Studies of magnetogenesis are partly motivated by the need to explain the origin of large-scale magnetic fields which are observed in galaxies or in clusters of galaxies [10]. If these magnetic fields have the primordial origin, the PMF should have influenced a variety of phenomena in the early universe [11,12,13,14,15,16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Effect of primordial magnetic field on seeds for large scale structure

et al. 2006

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Magnetic field plays a very important role in many astronomical phenomena at various scales of the universe. It is no exception in the early universe. Since the energy density, pressure, and tension of the primordial magnetic field affect gravitational collapses of plasma, the formation of seeds for large scale structures should be influenced by them. Here we numerically investigate the effects of stochastic primordial magnetic field on the seeds of large scale structures in the universe in detail. We found that the amplitude ratio between the density spectra with and without PMF (|P (k)/P0(k)| at k > 0.2 Mpc −1 ) lies between 75% and 130% at present for the range of PMF strengths 0.5 nG < B λ < 1.0 nG, depending on the spectral index of PMF and the correlation between the matter density and the PMF distributions.

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“…We will follow a purely phenomenological approach to this magnetic field, assuming that it emerged from previous fundamental processes whose details are beyond the scope of this paper (see brief description on cosmic magneto-genesis in the introduction and a comprehensive discussion in [9,10,11,8]) 3 .…”

Section: Physically Motivated Field Sourcesmentioning

confidence: 99%

“…The total energy density and pressures for 3 Assuming a present day value Ω Λ 0 ∼ 0.7 for a ΛCDM background, the contribution of the cosmological constant is absolutely negligible in the cosmic times under consideration, hence we omit it until we discuss the late evolution of the models in Sec. 6.3) the source (2)-(3) have the form:…”

Section: Physically Motivated Field Sourcesmentioning

confidence: 99%

“…Magnetic fields have been observed in all scales: our own galaxy [1], low [2] and high redshift [3] galaxies, and up to scales of galaxy clusters [4] and superclusters [5] (for comprehensive reviews see [6]). There is also indirect evidence, from gammaray observations of blazars [7] of coherent intergalactic magnetic fields in low density regions.…”

Section: Introductionmentioning

confidence: 99%

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A non-perturbative study of the evolution of cosmic magnetised sources

et al. 2015

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We undertake a hydrodynamical study of a mixture of tightly coupled primordial radiation, neutrinos, baryons, electrons and positrons, together with a gas of already decoupled dark matter WIMPS and an already existing "frozen" magnetic field in the infinite conductivity regime. Considering this cosmic fluid as the source of a homogeneous but anisotropic Bianchi I model, we describe its interaction with the magnetic field by means of suitable equations of state that are appropriate for the particle species of the mixture between the end of the leptonic era and the beginning of the radiation-dominated epoch. Fulfilment of observational bounds on the magnetic field intensity yields a "near FLRW" (but strictly non-perturbative) evolution of the geometric, kinematic and thermodynamical variables. This evolution is roughly comparable to the weak field approximation in linear perturbations on a spatially flat FLRW background of sources in which the frozen magnetic fields are coherent over very large supra-horizon scales. Our approach and results may provide interesting guidelines in potential situations in which non-perturbative methods are required to study the interaction between magnetic fields and the cosmic fluid.

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Discovery of extended Faraday rotation compatible with spiral structure in an intervening galaxy at Z = 0.395 - New observations of PKS 1229 - 021

Cited by 154 publications

References 0 publications

The Square Kilometre Array: a new probe of cosmic magnetism

The Square Kilometre Array: a new probe of cosmic magnetism

Effect of primordial magnetic field on seeds for large scale structure

A non-perturbative study of the evolution of cosmic magnetised sources

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