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- W2552675518 abstract "The Large Area Telescope [1] of the GLAST Observatory will study the cosmic gamma-radiation in the energy range 20 MeV – 500 GeV. LAT is being developed by an international collaboration (USA-FranceItaly-Japan-Sweden), and is scheduled for launch in 2007. Its predecessor, the Energetic Gamma Ray Experiment Telescope (EGRET), operated in orbit from 1991 to 2000. EGRET made the first complete survey of the sky in the energy range 30 MeV – >10 GeV [2], did extensive observations on active galactic nuclei (AGNs), pulsars, and diffuse gamma radiation, and discovered many sources of gamma radiation that are unidentified so far. LAT has superior performance compared to EGRET - 5 times larger effective area, better angular and energy resolution, wider field of view, and much smaller dead time. This will provide more than a factor of 30 in sensitivity as well as better capability to study transient phenomena. Since gamma-rays, unlike charged cosmic rays, are not deflected by interstellar magnetic fields, they are an excellent tool to study point sources such as AGN, supernova remnants (SNR), and pulsars, and of course to resolve the puzzle of unidentified gamma-ray sources remaining from the EGRET era. LAT will increase the number of known AGNs from ~70 to several thousand and will study their variability; it will discover up to several hundred gamma-ray pulsars. Detailed study of SNR will provide unique information about cosmic ray origin and acceleration. Exciting results are expected from the study of gamma-ray bursts, the most energetic events in the Universe, especially with the help of the Gamma-Ray Burst Monitor [3], also installed in GLAST. EGRET detected GeV-range photons in a few bursts; LAT has much better capability for studying this phenomenon. It is expected that GLAST will detect 50 - 100 bursts per year. Excellent timing characteristics will allow study of time profiles of the bursts, crucial to understanding their mechanism. The study of diffuse gamma-ray radiation will be a very significant contribution to the measurement of cosmic ray and interstellar matter distribution. Special subjects of LAT observations will be the Sun (following up on EGRET’s discovery of high energy gamma-rays in solar flares), and searching for signatures of dark matter that can be revealed in the annihilation of WIMPs. The wide energy range of the LAT provides unique opportunity to overlap with measurements made by ground-based TeV telescopes (CANGAROO, HESS, VERITAS, MILAGRO, MAGIC), which will contribute to multiwavelength measurements of gamma-ray objects (AGN, pulsars, bursts)." @default.
- W2552675518 created "2016-11-30" @default.
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- W2552675518 date "2005-01-01" @default.
- W2552675518 modified "2023-09-25" @default.
- W2552675518 title "The Large Area Gamma-Ray Telescope for GLAST Observatory" @default.
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