Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335704k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #357.04; Bulletin of the American Astronomical Society, Vol. 41, p.500
Mathematics
Logic
Scientific paper
The intergalactic medium is heated and ionized by cosmological shocks induced by gravitational clustering of the large scale structure of the universe. These cosmological shocks generate the vorticity behind shock surfaces and the vorticity decays into turbulent motion. Then weak intergalactic magnetic fields (IGMFs) can be amplified by turbulent motions through stretching of field lines in the tenuous plasma.
Using a high-resolution, cosmological N-body/hydrodynamic simulation, we estimated the distributions of the vorticity and turbulent kinetic energy density during the structure formation. At the present universe, the vortical motion is subsonic inside clusters and groups of galaxies, while it is either transonic or mildly supersonic elsewhere.
Employing the results of magnetohydrodynamic simulations of turbulent decay, we calculated the fraction of turbulent energy that is converted to the magnetic field energy through the turbulence dynamo. Applying the conversion factor to the results of the structure formation simulation, we found that the mean strength of the IGMFs could be on the order of microgauss inside clusters and groups, about 10 nanogauss in filaments, whereas it should be much lower in sheetlike structures and voids. We considered the effects of these IGMFs on the propagation of ultra-high energy cosmic rays from extragalactic sources to the Earth.
This work was supported by the Korea Foundation for International Cooperation of Science and Technology through grant K20702020016-07E0200-01610 provided by the Ministry of Education, Science and Technology.
Cho Jungyeon
Kang Hyesung
Ryu Dongsu
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