Introduction to gamma-ray astronomy GLAST-Large Area Telescope Introduction to GLAST Science New way of studying astrophysics Schedule of GLAST project Tuneyoshi Kamae SLAC/Hiroshima U. Astrophysics and Particle Physics with Gamma-ray Large Area Space Telescope (GLAST) Gamma-ray Large Area Space Telescope
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Introduction to gamma-ray astronomy GLAST-Large Area Telescope Introduction to GLAST Science New way of studying astrophysics Schedule of GLAST project.
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Introduction to gamma-ray astronomy GLAST-Large Area Telescope Introduction to GLAST Science New way of studying astrophysics Schedule of GLAST project
Tuneyoshi KamaeSLAC/Hiroshima U.
Astrophysics and Particle Physics withGamma-ray Large Area Space Telescope
(GLAST)
Gamma-ray Large Area Space Telescope
GLAST LAT ScienceGLAST LAT Science
GLAST LAT Provides:
• Rapid notification of high-energy transients
• Detection of several thousand sources, with spectra (20 MeV - > 50 GeV) for several hundred sources
• Point source localization to 0.3 – 2 arcmin
• Mapping and spectra of extended sources (e.g., SNRs, molecular clouds, interstellar emission, nearby galaxies)
• Measurement of the diffuse -ray background to TeV energies
Map the High-Energy Universe
0.01 GeV 0.1 GeV 1 GeV 10 GeV 100 GeV 1 TeV
Key Science Questions:• What are the mechanisms of particle
acceleration in the universe?
• What are the origins and mechanisms of Gamma-Ray Bursts and other transients?
• What are the unidentified EGRET Sources?
• What are the distributions of mass & cosmic-rays in the galaxy and in nearby galaxies?
• How can high-energy -rays be used to probe the early universe?
• What is the nature of dark matter?
FOV w/ energy measurement due to favorable aspect ratio
Effects of longitudinal shower profiling
More than 40 times the sensitivity of EGRET
Large Effective Area (20 MeV – 1 TeV)
Optimized Point Spread Function(0.35o @ 1 GeV)
Wide Field of View(2.4 sr)
Good Energy Resolution(E/E ~ 10%)
GLAST LAT Performance
History of Gamma-ray Astrophysics• OSO-III (1967): Prop. Counter, Hint of Galactic diffuse emission
• COS-B (1975): Spark ch., extended to E~2GeV, ~25 sources including an extragalactic source (3C273)
• EGRET(1991): Spark ch., extended to E~10GeV, ~271 sources including ~170 unidentified sources and a millisecond pulsar. 5 GRBs detected
• Ground-based Cherenkov Telescopes (~1993): Whipple, Cangaroo, and others detected gamma-rays from ~10 sources including Crab, SN1006, and bright AGNs