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On the optimum spacing of stereoscopic imaging atmospheric Cherenkov telescopes |
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| Institution: | a Max-Planck-Institut für Kernphysik, P.O. Box 103980, D-69029 Heidelberg, Germany b Yerevan Physics Institute, Yerevan, Armenia c Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München, Germany d Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain e Universität Kiel, Inst. für Experim. u Angew. Physik, Olshausenstr.40, D-24118 Kiel, Germany f BUGH Wuppertal, Fachbereich Physik, Gaußstr .20, D-42119 Wuppertal, Germany g Universität Hamburg, II. Inst. für Experimentalphysik, Luruper Chaussee 149, D-22761 Hamburg, Germany |
| Abstract: | For stereoscopic systems of imaging atmospheric Cherenkov telescopes a key parameter to optimize the sensitivity for VHE γ-ray point sources is the intertelescope spacing. Using pairs of telescopes of the HEGRA IACT system, the sensitivity of two-telescope stereo IACT systems is studied as a function of the telescope spacing, ranging from 70 to 140 m. Data taken during the 1997 outburst of Mrk 501 are used to evaluate both the detection rates before cuts, and the sensitivity for weak signals after cuts to optimize the significance of signals. Detection rates decrease by about 1/3 between the minimum and maximum spacings. The significance of signals is essentially independent of distance in the range investigated. |
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