Invited talk for the XVI International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2010), Batavia, IL, USA.
astro-ph/1011.4467

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COSMIC MAGNETIC FIELDS AND IMPLICATIONS FOR HE PARTICLE ANISOTROPIES

Philipp P. Kronberg


LANL, Los Alamos NM 87545, USA
and Dept. of Physics, University of Toronto, Toronto M5S 1A7, Canada


Abstract: I review what is known and surmised about magnetic fields in space, from our Milky Way environment to the distant Universe beyond the GZK horizon. This includes our gradually improving specification of the CR propagation environment within the Milky Way, the nearby universe within ~ 10 Mpc, and out to the GZK "horizon" near 100 Mpc. Within these modest intergalactic distances we hope for some pointing capability for CR energies above ~ 1019 eV, and for different species, as the observed event numbers accumulate in this range over the near future. The wider intergalactic propagation environment beyond the GZK horizon is also discussed. It sets a useful context for understanding other types of anisotropies, including sources of HE photons, neutrinos, leptons, etc. and for understanding relative time of arrival differences, such as those produced by lepton-photon cascades in the intergalactic medium. The global layout of potential UHECR sources is likely connected with the large scale structure (LSS) of cosmic filaments and voids, at least within ~ 100 Mpc. Possible source candidates for UHECR production are discussed, at various redshift ranges up to z ~ 2. Candidates discussed are AGN-jet sources, Centaurus A and more distant giant radio galaxies, and the possible indirect role of galaxies having a strong magnetized CR gas outflow that is driven by "starbursts" involving multiple supernovae and other energetic stellar events. Various analysis methods are described. I also discuss the current state of the results and near-future prospects for improving them.


Table of Contents

INTRODUCTION

MAGNETIC FIELD STRUCTURE ENVIRONMENT IN THE MILKY WAY
Global field structure from RM's
|Bt| vs. galactocentric radius

CENTAURUS A AND CANDIDATE UHECR SOURCES
The case of Centaurus A (NGC 5128)
3C 303 - a possible UHECR acceleration site

GLOBAL EVIDENCE FOR MAGNETIC ENERGY IN INTERGALACTIC SPACE
Black holes as sources of IGM magnetic fields
Early dwarf galaxy outflows before z ~ 7 as sources of IGM magnetic fields

OBSERVATIONAL EVIDENCE FOR BIGM BEYOND GALAXIES AND GALAXY CLUSTERS

EXPLORATION OF VOIDS AND REGIONS OF VERY LOW BIGM

REFERENCES

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