Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session C3: Very High Energy Cosmic Gamma Rays |
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Sponsoring Units: DAP DPF Chair: Reshmi Mukherjee, Barnard College Room: Hyatt Regency Dallas Landmark C |
Saturday, April 22, 2006 1:30PM - 2:06PM |
C3.00001: ABSTRACT WITHDRAWN |
Saturday, April 22, 2006 2:06PM - 2:42PM |
C3.00002: Recent Results from Milagro Invited Speaker: The Milagro Gamma Ray Observatory, a large field-of-view Water Cerenkov Air Shower Array designed to detect gamma rays near 1 TeV, is particularly suited for studying emission from extended gamma sources or broad structures in cosmic rays. Gamma rays are the best direct probe of cosmic rays outside our solar neighborhood. Gamma-ray emission up to 30GeV from a narrow band along the galactic equator has previously been detected by space-based instruments, notably EGRET. Results will be presented from a completed Milagro analysis giving evidence for TeV gamma ray emission from a mid-longitude region of the Galactic Plane. In a three-year data set with fixed region-of-interest a Milagro signal with a significance of 4.5 standard deviations has been detected above the cosmic ray background. This is interpreted as gamma rays from the interaction of cosmic rays with the interstellar medium at the Galactic equator. New developments from this work, ongoing investigations with a larger data set and different methodologies, will be described. Another study concentrates on the dominant charged cosmic-ray-initiated showers. Cosmic rays impinging on earth are expected to be nearly isotropic in celestial coordinates. Milagro's large aperture makes it an ideal instrument to detect small deviations from isotropy, such as predicted by Compton and Geller in 1935. Preliminary results on an observed anisotropy at levels of order 10$^{-3}$ will be presented. [Preview Abstract] |
Saturday, April 22, 2006 2:42PM - 3:18PM |
C3.00003: GLAST and the Future of High Energy Gamma-ray Astrophysics Invited Speaker: The Gamma-ray Large Area Space Telescope, GLAST, is a mission to measure the cosmic gamma-ray flux in the energy range 20 MeV to $>$300 GeV, with supporting measurements for gamma-ray bursts from 10 keV to 25 MeV. With its launch in 2007, GLAST will open a new and important window on a wide variety of high energy phenomena, including black holes and active galactic nuclei; gamma-ray bursts; the origin of cosmic rays and supernova remnants; and searches for hypothetical new phenomena such as supersymmetric dark matter annihilations, Lorentz invariance violation, and exotic relics from the Big Bang. In addition to the science opportunities, this talk will include a description of the instruments and the mission status. These topics will be discussed in the context of anticipated breakthrough measurements from other gamma-ray facilities in the future. [Preview Abstract] |
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