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Results from observations of AGNs with the H.E.S.S. telescope system and Future plans
Punch M.
Dans Exploring the Cosmic Frontier Astrophysical Instruments for the 21st Century - Exploring the Cosmic Frontier Astrophysical Instruments for the 21st Century, Berlin : Allemagne (2004) - http://hal.in2p3.fr/in2p3-00023550
Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics
Sciences of the Universe/Astrophysics/Cosmology and Extra-Galactic Astrophysics
Sciences of the Universe/Astrophysics
Results from observations of AGNs with the H.E.S.S. telescope system and Future plans
M. Punch1, 2
1:  APC - UMR 7164 - AstroParticule et Cosmologie
http://www.apc.univ-paris7.fr/
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
France
2:  PCC - Physique Corpusculaire et Cosmologie - Collège de France
CNRS : UMR7553 – IN2P3 – Université Paris VII - Paris Diderot
11, place Marcelin Berthelot - 75231 Paris Cedex 05
France
APC - AHE
The H.E.S.S. (High Energy Stereoscopic System) phase I is comprised of four Imaging Atmospheric Cherenkov telescopes, for observation of galactic and cosmic sources of very high energy gamma rays. Its installation in the Khomas highlands, Namibia has been completed in December, 2003. The first of these telescopes was installed in June 2003, and data-taking has proceeded since that time. The HESS telescope system provides a significant improvement in sensitivity and a threshold for detection below that of previous Imaging Atmospheric Cherenkov Telescopes. The characteristics for the phase-I will be presented, together with plans for phase-II of the experiment, comprised of a large telescope in the centre of the current phase-I providing a lowered threshold and increased sensitivity. We can observe AGNs up to redshift 0.5 with HESS and 2-3 with HESS Phase-2, which provides a unique capability for study of spectral and temporal characteristics on timescales of several hours or even less than 1 h (depending on the strength of flares). We will present the first results from a number of southern AGN observed during the installation of the phase-I, in particular concerning the detection and spectral properties of the AGN PKS2155$-$305.
HESS

Conference proceedings
2007
2004-05
Exploring the Cosmic Frontier Astrophysical Instruments for the 21st Century
international
A.P. Lobanov, J.A. Zensus, C. Cesarsky, Ph. Diamond
175-178
Springer
ESO Astrophysics Symposia

Exploring the Cosmic Frontier Astrophysical Instruments for the 21st Century
Berlin
Germany
2004-05-18
2004-05-21

APC-PCC 04 69
Springer-Verlag series "ESO Astrophysics Symposia"
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