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Events on Thursday, December 6th, 2012

NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Searching for Pulsars and Radio Transients with the Murchison Widefield Array
Time: 2:30 pm
Place: 4274 Chamberlin Hall
Speaker: David Kaplan, UW Milwaukee, Department of Physics
Abstract: As one of a new generation of widefield, low-frequency radio
telescopes, the Murchison Widefield Array has enormous potential to
conduct blind searches for radio transients and probe the nearby
pulsar population. We are working to develop a common framework
with the Australian Square Kilometer Array Pathfinder (ASKAP)
Variables and Slow Transients (VAST) survey to allow real-time
transient detection and characterization. I will discuss the expected
types of sources that we hope to discover with the full array and
review some of the initial results from our 32-element testbed.
Host: Peter Timbie
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Astronomy Colloquium
Adaptive Mesh Refinement Dimulations of Cosmic Rays in Clusters of Galaxies
Time: 3:30 pm
Place: 4421 Sterling Hall
Speaker: Samuel Skillman, University of Colorado
Abstract: The observed properties of galaxy clusters are the result of a non-linear interaction between many physical processes including gravity, hydrodynamics, magnetic fields, turbulence, radiation, galaxy formation and feedback, and cosmology. This provides a unique "cosmic laboratory" with which we can learn about our Universe. In particular, galaxy clusters are hosts to cosmic shocks, which propagate through the intracluster medium as a signature of structure formation. It is believed that at these shock fronts, magnetic field inhomogeneities in a compressing flow may lead to the acceleration of cosmic ray electrons and ions. These relativistic particles decay and radiate through a variety of mechanisms, and have observational signatures in radio, hard X-ray, and Gamma-ray wavelengths. The construction of several new low frequency radio telescopes have begun observations of aEurooeradio relicsaEuro, which are thought to be the result of synchrotron emission from shock accelerated electrons. I will present recent work using adaptive mesh refinement MHD simulations of galaxy clusters using Enzo and analyzed with yt, that explain many of the observed properties of these radio relics including polarization fraction and direction of the radiation. I will also present preliminary work of combining a numerical library for momentum-space transport of cosmic rays with Enzo, where we can follow the spectral evolution of these high energy particles along with their spatial transport.
Host: Prof Sebastian Heinz
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Graduate Introductory Seminar
Quantum Computing & Information
Time: 5:45 pm
Place: 2223 Chamberlin Hall
Speaker: , UW Madison
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