The Gamma Ray Large Area Space Telescope:. AN Astro-Particle Mission to Explore the High Energy Gamma Ray Sky

Details The Gamma Ray Large Area Space Telescope:. AN Astro-Particle Mission to Explore the High Energy Gamma Ray Sky The Gamma Ray Large Area Space Telescope:. AN Astro-Particle Mission to Explore the High Energy Gamma Ray Sky

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003tsra.symp..141b&link_type=abstract

TEXAS IN TUSCANY. Proceedings of the XXI Symposium on Relativistic Astrophysics. Held 9-13 December 2002 in Florence, Italy. Edi

Astronomy and Astrophysics

Astrophysics

Gamma-Ray Telescopes, Space Telescopes, Glast

Scientific paper

The Gamma Ray Large Area Space Telescope (GLAST) is a space mission that will detect photons from the gamma ray sky, in the rich yet poorly explored high energy band between 20MeV and 1TeV. Main instrument on board is the Large Area Telescope (LAT), a gamma-ray pair-conversion telescope, that will measure direction and energy of incoming photons by means of a very large (11.000 sensors), low pitch (228 μm) Silicon strip Tracker and an imaging CsI e.m. calorimeter, supported in the rejection of charged particles background by an outer, segmented Anti-Coincidence Detector built with plastic scintillators. The superior angular resolution of the LAT, coupled to its very large field of view, results in a sensitivity advance of a factor 30 or more with respect to previously flown instruments. This will allow GLAST to locate currently unresolved gamma ray sources and to detect potential new classes of sources. Study of the residual gamma ray background will have a crucial role in connection to cosmological models, supersymmetric dark matter and relics of exotic particle decay searches. An accurate spectroscopy of all gamma ray emitters will be possible with the high energy resolution of the calorimeter, improving our knowledge of the mechanisms that power the cores of blazars and AGNs, and enabling tens of different pulsar emission models. The GLAST mission will have the instrumental capabilities to locate and analyse sources of cosmic rays and investigate on their acceleration mechanism. As for transient phenomena studies, like the spectacular GRBs, known to be the most energetic natural events, GLAST is in a prominent position. This is due to the minimum detection dead time (<100 μs), typical of the silicon detectors used for the LAT tracker, and to the increased field of view and alert capabilities of the second GLAST instrument, the Gamma Burst Monitor (GBM), essentially conceived as a fast transients trigger for the more accurate observations from the LAT and from other space and earth missions sensitive to other wavelengths. In this paper we give an overview of the many physics goals and potential reach of the GLAST observatory, we describe in detail the detector design and performances and report on the status of the LAT tracker construction.

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