Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe..52r&link_type=abstract
Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 10, 2006, Kavli Institute for Theoretical Physics,
Physics
Scientific paper
Collisionless plasmas are a common feature of many astrophysical systems(e.g. active galactic nuclei, supernova remnants, clusters of(galaxies) and exhibit unique properties stemming from the loose couplingbetween particle species and the plasma instabilities that can acceleratesome species efficiently and others not at all. Supernova remnant shocksare efficient particle accelerators and may be responsible for the bulk ofcosmic rays below 1000 TeV. Galactic and Magellanic Cloud remnants areclose enough that the Chandra X-ray observatory has enabled us to spatiallyresolve theshock heated material as it relaxes downstream. A complete picture of theparticle acceleration in collisionless shocks requires the examination ofthe magnetic field, the thermal and cosmic raypopulations of protons, ion and electrons, and the dynamical effects ofmagnetic field amplification and cosmic ray losses. In this talk I willfocus on the diagnostic capabilities of X-ray spectralobservations of the thermal plasma advecting away from the shock todetermine not only the initial electron heating at the shock front butalso to see the effects of the elusive cosmic-ray ions.
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