Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session T3: High Energy Gamma Ray Astronomy |
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Sponsoring Units: DAP Chair: Neil Gehrels, NASA-GSFC Room: Hyatt Regency Jacksonville Riverfront Grand 2 |
Monday, April 16, 2007 1:30PM - 2:06PM |
T3.00001: The Gamma-ray Large Area Space Telescope Mission Invited Speaker: |
Monday, April 16, 2007 2:06PM - 2:42PM |
T3.00002: The VERITAS View of the TeV Gamma-ray Universe Invited Speaker: The study of the universe in TeV gamma-rays is the study of the sources and distribution of very high energy particles (electrons and hadrons). The advent of advanced systems of atmospheric Cherenkov imaging telescope arrays has opened this extreme universe to observations with high sensitivity. Somewhat surprisingly these ground-based techniques match, or exceed, the sensitivity of space telescopes at lower energies and hence provide complementary observations to the upcoming AGILE and GLAST missions. VERITAS (the Very Energetic Radiation Imaging Telescope Array System) in southern Arizona is one such system which has recently come on-line. It consists of four telescopes of 12 m aperture and cameras with 499 pixels. It has a sophisticated triggering and recording system which includes 500 MHz FADCs. In the first two years of operation, the Key Science Projects include a Sky Survey, the study of Northern Hemisphere Supernova Remnants and bright TeV-gamma-ray-emitting Blazars, and the search for signatures of Dark Matter. There is now evidence that the emission of very high energy gamma rays is ubiquitous with a wide variety of both galactic and extragalactic sources; hence TeV gamma-ray astronomy promises to be a fertile new discipline in high energy astrophysics. [Preview Abstract] |
Monday, April 16, 2007 2:42PM - 3:18PM |
T3.00003: The VHE gamma-ray sky viewed with H.E.S.S. Invited Speaker: During its first years of operation, the H.E.S.S. array of imaging atmospheric Cherenkov telescopes has revealed a large number of new VHE gamma-ray sources, many of them discovered in a survey of the Galactic plane. Among these objects are supernova remnants with resolved morphology, pulsar wind nebulae, binary systems as well as a significant number of unidentified sources which do not show detectable emission in other wavebands. Spectra measured for extragalactic sources are used to constrain the level of extragalactic background light, with the result that the Universe is significantly more transparent to VHE gamma rays than previously assumed. The talk will provide an overview of the main findings from H.E.S.S., with emphasis on recent results. [Preview Abstract] |
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