Magnetic field transport from AGN cores to jets, lobes, and the IGM

Kronberg, P. P.

doi:10.1017/s1743921309031172

Cited by 3 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These huge systems include the Ly-α forest and intercluster regions (see Kronberg 2009, for a review). Both pre-and post-recombination mechanisms could result in a background of nano-gauss fields that might be detectable in large-scale structures or the CMB, although at present no imprints of these Primordial Magnetic Fields (PMFs) have been detected therein.…”

Section: Discussionmentioning

confidence: 99%

Planck2013 results. XXIII. Isotropy and statistics of the CMB

Ade¹,

Aghanim²,

Akrami³

et al. 2014

A&A

390

275

View full text Add to dashboard Cite

The two fundamental assumptions of the standard cosmological model -that the initial fluctuations are statistically isotropic and Gaussian -are rigorously tested using maps of the cosmic microwave background (CMB) anisotropy from the Planck satellite. The detailed results are based on studies of four independent estimates of the CMB that are compared to simulations using a fiducial ΛCDM model and incorporating essential aspects of the Planck measurement process. Deviations from isotropy have been found and demonstrated to be robust against component separation algorithm, mask choice, and frequency dependence. Many of these anomalies were previously observed in the WMAP data, and are now confirmed at similar levels of significance (about 3σ). However, we find little evidence of non-Gaussianity, with the exception of a few statistical signatures that seem to be associated with specific anomalies. In particular, we find that the quadrupole-octopole alignment is also connected to a low observed variance in the CMB signal. A power asymmetry is now found to persist on scales corresponding to about = 600 and can be described in the low-regime by a phenomenological dipole modulation model. However, any primordial power asymmetry is strongly scale-dependent and does not extend to arbitrarily small angular scales. Finally, it is plausible that some of these features may be reflected in the angular power spectrum of the data, which shows a deficit of power on similar scales. Indeed, when the power spectra of two hemispheres defined by a preferred direction are considered separately, one shows evidence of a deficit in power, while its opposite contains oscillations between odd and even modes that may be related to the parity violation and phase correlations also detected in the data. Although these analyses represent a step forward in building an understanding of the anomalies, a satisfactory explanation based on physically motivated models is still lacking.

show abstract

Section: Discussionmentioning

confidence: 99%

Planck2013 results. XXIII. Isotropy and statistics of the CMB

Ade¹,

Aghanim²,

Akrami³

et al. 2014

A&A

390

275

View full text Add to dashboard Cite

show abstract

“…More needs to be done to resolve the issues. In examining data from an extra galactic radio jet, Kronberg [725] concludes that the energy flow is dominated by the Poynting flux rather than the kinetic energy of the jet. An estimate of the magnetic field from Faraday rotation of 3C 303 gives 3 mG (3×10 −7 T) at a distance from the jet axis of 400 pc leads to an axial current of ∼10 18 A in a low pitch reversed field pinch configuration with β estimated as 10 −5 .…”

Section: Laboratory Astrophysicsmentioning

confidence: 99%

A review of the denseZ-pinch

Haines

2011

Plasma Phys. Control. Fusion

394

184

View full text Add to dashboard Cite

The Z-pinch, perhaps the oldest subject in plasma physics, has achieved a remarkable renaissance in recent years, following a few decades of neglect due to its basically unstable MHD character. Using wire arrays, a significant transition at high wire number led to a great improvement in both compression and uniformity of the Z-pinch. Resulting from this the Z-accelerator at Sandia at 20 MA in 100 ns has produced a powerful, short pulse, soft x-ray source >230 TW for 4.5 ns) at a high efficiency of ∼15%. This has applications to inertial confinement fusion. Several hohlraum designs have been tested. The vacuum hohlraum has demonstrated the control of symmetry of irradiation on a capsule, while the dynamic hohlraum at a higher radiation temperature of 230 eV has compressed a capsule from 2 mm to 0.8 mm diameter with a neutron yield >3 × 10 11 thermal DD neutrons, a record for any capsule implosion. World record ion temperatures of >200 keV have recently been measured in a stainless-steel plasma designed for Kα emission at stagnation, due, it was predicted, to ion-viscous heating associated with the dissipation of fast-growing short wavelength nonlinear MHD instabilities. Direct fusion experiments using deuterium gas-puffs have yielded 3.9×10 13 neutrons with only 5% asymmetry, suggesting for the first time a mainly thermal source. The physics of wire-array implosions is a dominant theme. It is concerned with the transformation of wires to liquid-vapour expanding cores; then the generation of a surrounding plasma corona which carries most of the current, with inward flowing low magnetic Reynolds number jets correlated with axial instabilities on each wire; later an almost constant velocity, snowplough-like implosion occurs during which gaps appear in the cores, leading to stagnation on the axis, and the production of the main soft-x-ray pulse. These studies have been pursued also with smaller facilities in other laboratories around the world. At Imperial College, conical and radial wire arrays have led to highly collimated tungsten plasma jets with a Mach number of >20, allowing laboratory astrophysics experiments to be undertaken. These highlights will be underpinned in this review with the basic physics of Z-pinches including stability, kinetic effects, and finally its applications.

show abstract

Primordial Magnetic Fields and Cosmic Microwave Background

Battaner

Florido

2011

Einstein and the Changing Worldviews of Physics

View full text Add to dashboard Cite

Magnetic field transport from AGN cores to jets, lobes, and the IGM

Cited by 3 publications

References 20 publications

Planck2013 results. XXIII. Isotropy and statistics of the CMB

Planck2013 results. XXIII. Isotropy and statistics of the CMB

A review of the denseZ-pinch

Primordial Magnetic Fields and Cosmic Microwave Background

Contact Info

Product

Resources

About