Results 211 to 220 of about 1,204 (229)

Extragalactic magnetic fields

Reports on Progress in Physics, 1994
The observational methods for detecting and measuring extragalactic magnetic fields are discussed, along with some new indirect methods which could be used for inferring field strengths at large redshifts which are otherwise beyond the reach of direct measurement.
P P Kronberg
exaly   +2 more sources

ELMAG 3.01: A three-dimensional Monte Carlo simulation of electromagnetic cascades on the extragalactic background light and in magnetic fields

Computer Physics Communications, 2020
The version 3.01 of ELMAG, a Monte Carlo program for the simulation of electromagnetic cascades initiated by high-energy photons and electrons interacting with extragalactic background light (EBL), is presented.
M Kachelries, S Ostapchenko
exaly   +3 more sources

Inhomogeneous extragalactic magnetic fields and the second knee in the cosmic ray spectrum

Physical Review D, 2008
International audienceVarious experiments indicate the existence of a second knee around energy E=3×1017eV in the cosmic ray spectrum. This feature could be the signature of the end of the galactic component and of the emergence of the extragalactic one,
Kumiko Kotera, Martin Lemoine
exaly   +2 more sources

Stochastic conversions of TeV photons into axion-like particles in extragalactic magnetic fields

Journal of Cosmology and Astroparticle Physics, 2009
Very-high energy photons emitted by distant cosmic sources are absorbed on the extragalactic background light (EBL) during their propagation. This effect can be characterized in terms of a photon transfer function at Earth.
Alessandro Mirizzi, Daniele Montanino
exaly   +2 more sources

On the orientation of magnetic fields in extragalactic radiosources

Astronomical and Astrophysical Transactions, 2001
Abstract We studied the relative orientation of position angles of the integrated intrinsic radio polarization (perpendicular to the intrinsic direction of the magnetic field) and the major axes of extragalactic radiosources for different types of radiosources, classified by their elongation (Andreasyan and Sol, 1999) and also according to their ...
R. Andreasyan, H. Sol, S. Appl
exaly   +2 more sources

Extragalactic background light and extragalactic magnetic fields

AIP Conference Proceedings, 2012
VHE γ-rays from distant blazars several hundred Mpc away are attenuated through pair production interactions on extragalactic background light (EBL). Subsequent to their generation, electron/positron pairs proceed to produce γ-rays through IC interactions leading to the development of an electromagnetic (EM) cascade.
openaire   +1 more source

Extragalactic magnetic fields revealed

Astronomische Nachrichten, 2017
In this paper, the strongest limits, obtained from rotation measures on cosmological magnetic fields, are presented.
openaire   +1 more source

Extragalactic jets with helical magnetic fields

2009
Extragalactic jets harbor dynamically important, organized magnetic fields. We explore with grid-adaptive, high resolution numerical simulations the morphology of AGN jets pervaded by helical field and flow topologies. We concentrate on the long term evolution of kinetic energy dominated jets, penetrating denser clouds. The jets have near-equipartition
Keppens, R., Meliani, Z., Tsinganos, K., et al.,   +3 more
openaire   +2 more sources

The role of magnetic fields in extragalactic astronomy

Astrophysics and Space Science, 1981
The evidence is reviewed for a universal magnetic field of strength 10−9–10−8G; it has been extended to include the diffuse fields of galactic clusters and the extensive magnetic halos of spiral galaxies. Some likely effects of the universal fieldB 0 are as follows: (1) As suggested previously,B 0 is coupled to protogalaxies and evolves into magnetic ...
openaire   +1 more source

EXTRAGALACTIC COSMIC RAYS AND MAGNETIC FIELDS: FACTS AND FICTION

Journal of the Korean Astronomical Society, 2004
A critical discussion of our knowledge about extragalactic cosmic rays and magnetic fields is at-tempted. What do we know for sure? What are our prejudices? How do we confront our models with the observations? How can we assess the uncertainties in our modeling and in our observations? Unfortunately, perfect answers to these questions can not be given.
exaly   +3 more sources