Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session R2: New Eyes on the Universe II |
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Sponsoring Units: DAP DPF Chair: Brenda Dingus, Los Alamos National Laboratory Room: Plaza D |
Monday, May 4, 2009 1:30PM - 2:06PM |
R2.00001: The VERITAS gamma-ray observatory: Recent observations and status Invited Speaker: VERITAS, an imaging atmospheric Cherenkov array for gamma-ray astronomy in the GeV - TeV range, has recently completed its first season of observations with a full array of four telescopes. A number of astrophysical gamma-ray sources have been detected, both galactic and extragalactic, including sources previously unknown at TeV energies. We shall discuss the present status of VERITAS, and present a number of results from recent observations. [Preview Abstract] |
Monday, May 4, 2009 2:06PM - 2:42PM |
R2.00002: Milagro Observations of the TeV Sky Invited Speaker: The Milagro air shower array in the Jemez mountains above Los Alamos was decommissioned in June 2008 after four years of operation at full sensitivity. The central Milagro 80x60 meter water pond was instrumented with 723 Photo-multiplier Tubes and was operated since 1999. In 2004 an array of 176 outrigger water tanks, each hosting a single PMT, was added, completing the detector. Milagro was the first experiment to use water-Cherenkov technology to measure astrophysical TeV gamma rays and complements IACT observations with it's large duty factor and wide field of view. The Milagro Collaboration has previously announced discovery of new discrete TeV gamma-ray sources and measurement of diffuse TeV fluxes from the Galactic plane and the Cygnus region of the galaxy. The final analysis of the full Milagro dataset will be presented, focusing on the measured energy spectra of Milagro gamma-ray sources. Two unexpected localized excesses of cosmic rays will also be shown. These cosmic-ray excesses are particularly interesting because they cannot be explained with conventional understanding of the local and galactic magnetic fields and may suggest the presence of a nearby accelerator. Finally these observations will be discussed in the context of the search for the origin of cosmic rays. [Preview Abstract] |
Monday, May 4, 2009 2:42PM - 3:18PM |
R2.00003: Recent Results from IceCube Invited Speaker: In two more construction seasons IceCube, the first cubic-kilometer neutrino telescope, will be completed according to the initial schedule. The instrumentation of this extremely large volume allows to measure neutrinos in the energy range from about 100 GeV up to energies larger than $10^{17}$ eV. When complete, IceCube will reach sensitivites well below expected neutrino fluxes from astrophysical sources accelerating hadrons. A ground-based extensive air-shower, IceTop, measuring showers induced by primaries of energy between $10^{15} - 10^{17}$ eV, enriches the physics potential of this observatory at the South Pole operating standalone and in coincidence with the deep ice detector. The current results of IceCube in incomplete configurations and the physics reach of the full detector will be discussed as well as the low energy extension DeepCore and possible high energy extensions. [Preview Abstract] |
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