University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, April 28, 2008
Coffee, Tea & Snacks 4:15-4:30 PM

Scott Nutter
Northern Kentucky University
CREST: The Cosmic Ray Electron Synchrotron Telescope

There is strong indirect evidence for the supernova shock acceleration of galactic cosmic-ray electrons through observations of non-thermal X-rays and TeV gamma rays from supernova remnants. To date, no cosmic ray electron measurements have been made at energies greater than 2 TeV. Since high-energy electrons lose energy rapidly during propagation in the Galaxy through synchrotron and inverse Compton processes, TeV electrons reaching the solar system have to originate at distances < 1 kpc, thus the detection of high-energy electrons would yield information about the spatial distribution of nearby cosmic ray sources. The balloon-borne CREST experiment will detect high-energy electrons by measuring the X-ray synchrotron photons generated by these electrons in the Earth's magnetic field. This method achieves very large detector apertures, since the instrument need only intersect a portion of the line of photons (which extend over hundreds of meters of space) and not necessarily the electron itself.

Sponsored by: Department of Physics and the Institute for Physical Science and Technology, University of Maryland. For information call Catha Stewart at (301) 405-4811 or go to the UMD Space Physics group seminar web site.

There is free parking after 4:00 PM in lot B (the big parking garage across the street from the ATL building). There are a limited number of spaces in lot Q next to the new ATL wing with free parking after 4PM even when there is a basketball game on campus.