On the optimum spacing of stereoscopic imaging atmospheric Cherenkov telescopes

Details On the optimum spacing of stereoscopic imaging atmospheric Cherenkov telescopes On the optimum spacing of stereoscopic imaging atmospheric Cherenkov telescopes

1999-10-25

arxiv.org/abs/astro-ph/9910443v1

Astronomy and Astrophysics

Astrophysics

9 Pages, 3 Figures, Latex

Scientific paper

For stereoscopic systems of imaging atmospheric Cherenkov telescopes (IACTs), a key parameter to optimize the sensitivity for VHE gamma-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 m 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 spacing. The significance of signals is essentially independent of distance, in the range investigated.

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