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A new template background estimate for source searching in TeV gamma-ray astronomy

MPG-Autoren
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Rowell,  Gavin
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Rowell, G. (2003). A new template background estimate for source searching in TeV gamma-ray astronomy. Astronomy & Astrophysics, 410(1), 389-396. doi:10.1051/0004-6361:20031194.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-8E09-9
Zusammenfassung
A new method is described that permits quickly and easily, a 2-dimensional search for TeV gamma-ray sources over large fields of view (~6°) with instruments utilising the imaging atmospheric Cerenkov 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 Cerenkov 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.