Computer Science – Performance
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..407v&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Computer Science
Performance
Scientific paper
The HESS experiment began taking data in the middle of 2002 when the first telescope was commissioned. The stereoscopic system is operational since the installation of the second camera, at the start of 2003, and the system is now fully operational with the four telescopes installed by the end of December, 2003. Many galactic and extragalactic objects have been observed since operation began, and the detection of various sources such as the Crab Nebula, the AGN PKS2155-304, and the binary pulsar system PSR 1259-63 -- amongst others -- in the short intervening time interval has proven the performance of the detector and validated the technical options chosen. The collaboration is currently studying the next phase of the HESS project. The detector system currently in operation has a threshold above 100 GeV. Many sources such as pulsars, micro-quasars, or neutralino annihilation are expected to emit gamma radiation at lower energy. Furthermore, the absorption of high energy gammas by the intergalactic infrared background limits the observation depth of these experiments. A lower threshold will allow the sensitivity to distant sources to be increased, and additionally will enable us to improve our knowledge of the infra-red background. It will also be useful to have a better overlap between the HESS experiment and the future space observatories for intercalibration of both detectors. The second phase of the HESS experiment consists of an additional larger telescope positioned in the centre of the existing four-telescope array. With a 600 m2 miror, a 2,000-pixel camera with a FoV of about 3.5o and a telescope of 35 meters focal length the new system may reach a threshold as low as 10-20 GeV in single telescope mode and about 50 GeV in coincidence with the four other telescopes. The construction should start in 2005 and the installation is expected to take place in 2008, less than one year after the launch of the GLAST observatory. After a brief overview of the HESS phase I experiment, we will describe the motivation of a new large telescope for high energy gamma ray research. Then the set-up and expected performance are presented.
E. S. S Collaboration H.
Vincent Pascal
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