Astrophysics and Astronomy

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HESS: RXJ1713 First resolved

TeV g-ray image of a

Shell type SNR (Resolution ~10 arcmin)

Acceleration source of Cosmic Rays, but is it evidence of

Protons?

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HESS: RXJ1713 – Molecular Clouds

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RXJ1713 Spectrum

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Have g-rays from p0 decay been discovered?

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Milagro (TeV) Diffuse Source

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Active Galactic Nuclei

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Active Galactic Nuclei (AGN)

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VLA image of Cygnus A

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GZK

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Cosmogenic neutrinos are guaranteed if primaries are nucleons.

May be much larger fluxes, for some models, such as topological defects

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GZK

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GRBs

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Shocks: external collisions with interstellar material or internal collisions when slower material is overtaken by faster in the fireball.

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Slide 26

Generic GRB Explosion Models

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Lorentz Invariance Violation

Bounds on energy dependence of the speed of light can be used to place

constraints on the effective energy scale for quantum gravitational effects.

E2-c2p2~E2x(E/EQG)a - This may be modified in some quantum gravity

models.

This has the important observational consequence that this will give

rise to energy dependent delays between arrival times of photons.

Slide 28

Galactic Microquasars

Slide 29