EDP Sciences
Free Access
Issue
A&A
Volume 410, Number 1, October IV 2003
Page(s) 389 - 396
Section Physical and chemical processes
DOI https://doi.org/10.1051/0004-6361:20031194
Published online 17 November 2003


A&A 410, 389-396 (2003)
DOI: 10.1051/0004-6361:20031194

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

G. P. Rowell

Max Planck Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany
(Received 21 May 2003 / Accepted 30 July 2003 )

Abstract
A new method is described that permits quickly and easily, a 2-dimensional search for TeV $\gamma$-ray sources over large fields of view (~ $6^\circ$) 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.


Key words: methods: data analysis -- gamma rays: observations

SIMBAD Objects



© ESO 2003

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.