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This book provides a theoretical and observational overview of the state of the art of gamma-ray astrophysics, and their impact and connection with the physics of cosmic rays and neutrinos. With the aim of shedding new and fresh light on the problem of the nature of the gamma-ray sources, particularly those yet unidentified, this book summarizes contributions to a workshop that continues with the series initiated by the meeting held at Tonantzintla in October 2000, and Hong-Kong in May 2004. This books will be of interest for all active researchers in the field of high energy astrophysics and astroparticle physics, as well as for graduate students entering into the subject.

Gamma ray sources --- Particles (Nuclear physics) --- Gamma ray production --- Gamma sources --- Sources, Gamma ray --- Gamma rays --- Radiation sources --- Astronomy. --- Astronomy, Astrophysics and Cosmology. --- Astronomy, Observations and Techniques. --- Astrophysics and Astroparticles. --- Astrophysics. --- Observations, Astronomical. --- Astronomy—Observations. --- Astronomical observations --- Observations, Astronomical --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics

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Nominated as an outstanding thesis by the Department of Physics and Astronomy of the University of New Mexico, this thesis seeks to identify the gamma-ray burst (GRB) progenitor.  GRBs are extragalactic explosions that briefly outshine entire galaxies, but the mechanism that can release that much energy over a < 100 second burst is still a mystery.  The leading candidate for the GRB progenitor is currently a massive star which collapses to form a black hole–accretion disk system that powers the GRB.  GRB afterglows, however, do not always show the expected behavior of a relativistic blast wave interacting with the stellar wind that such a progenitor should have produced before its collapse. In this book, the author uses the Zeus-MP astrophysical hydrodynamics code to model the environment around a stellar progenitor prior to the burst.  He then develops a new semi-analytic MHD and emission model to produce light curves for GRBs encountering these realistic density profiles.  The work ultimately shows that the circumburst medium surrounding a GRB at the time of the explosion is much more complex than a pure wind, and that observed afterglows are entirely consistent with a large subset of proposed stellar progenitors.

Gamma ray bursts. --- Gamma ray sources. --- Bursts, Cosmic gamma ray --- Bursts, Gamma ray --- Cosmic gamma ray bursts --- Transients, Gamma ray --- Gamma ray astronomy --- X-ray bursts --- Gamma ray production --- Gamma sources --- Sources, Gamma ray --- Gamma rays --- Radiation sources --- Astrophysics. --- Mathematical physics. --- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics). --- Mathematical Methods in Physics. --- Physical mathematics --- Physics --- Astronomical physics --- Astronomy --- Cosmic physics --- Mathematics --- Space sciences. --- Physics. --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Science and space --- Space research --- Cosmology --- Science