Issue |
A&A
Volume 410, Number 1, October IV 2003
|
|
---|---|---|
Page(s) | 389 - 396 | |
Section | Astronomical instrumentation | |
DOI | https://doi.org/10.1051/0004-6361:20031194 | |
Published online | 17 November 2003 |
A new template background estimate for source searching in TeV γ-ray astronomy
Max Planck Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany
Corresponding author: Gavin.Rowell@mpi-hd.mpg.de
Received:
21
May
2003
Accepted:
30
July
2003
A new method is described that permits quickly and easily, a 2-dimensional search for TeV γ-ray
sources over large fields of view (~) with instruments utilising the imaging atmospheric Čerenkov
technique. It employs as a background estimate,
events normally rejected according to a cosmic-ray background rejection criterion based on image shape,
but with reconstructed directions overlapping the source of interest.
This so-called template background model is demonstrated using example data taken with the stereoscopic HEGRA System of Čerenkov Telescopes. Discussion includes comparisons with a conventional background estimate and limitations of the model. The template model is well suited to the search for point-like, moderately extended sources and combinations thereof, and compensates well
for localised systematic changes in cosmic-ray background response.
Key words: methods: data analysis / gamma rays: observations
© ESO, 2003
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