PARTICLE ASTROPHYSICS LECTURE 12 Cosmic Rays/DM …gpe/palec7.pdf · Isotropic fraction Figure 3:...
Transcript of PARTICLE ASTROPHYSICS LECTURE 12 Cosmic Rays/DM …gpe/palec7.pdf · Isotropic fraction Figure 3:...
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PARTICLE ASTROPHYSICS LECTURE 12Cosmic Rays/DM Annihilation
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LHC E ~ 14 TeV Cosmic rays
LHC
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Akeno Giant Air Shower Array (AGASA)
HiRes
Pierre Auger Observatory
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Differences in abundance can be understood by spallation: destruction of heavierelements in collisions with ISM to produce lighter nuclei, in particular Be, Li, B.
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Nearby Galactic Magnetic Field
r
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Cassiopeia A supernova remnant
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p
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But - Auger and HiRes see a GZK cut-off:
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Cen AAngular distribution of Auger UHE events
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Latest results from Auger:
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Correlation with luminous X-ray sources:
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Composition:
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Numerical simulation of dark matter halo
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Fermi launched 2008detects gamma-rays in energy range 30 MeV – 300 GeV
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Annihilation Emission from Milky Way
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Observed gamma ray emission from Milky Way centre (from Hooperand Linden arXiv:1110.0006).
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DM annihilation from clusters of galaxies? (Han etal arXiv:1201.1003)
Expected emission profilefrom Virgo cluster
Fits to Fermi data
`Fiducial' CR model
'Free' fit to CR model
Fit with no CRs
Constrained CR amplitude
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