Extending the Li&Ma method to include PSF information



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Nievas Rosillo, Mireia and Contreras González, José Luis (2016) Extending the Li&Ma method to include PSF information. Astroparticle physics, 74 . pp. 51-57. ISSN 0927-6505

[thumbnail of Contreras JL 02 preprint.pdf]

Official URL: http://dx.doi.org/10.1016/j.astropartphys.2015.10.001


The so called Li&Ma formula is still the most frequently used method for estimating the significance of observations carried out by Imaging Atmospheric Cherenkov Telescopes. In this work a straightforward extension of the method for point sources that profits from the good imaging capabilities of current instruments is proposed. It is based on a likelihood ratio under the assumption of a well-known PSF and a smooth background. Its performance is tested with Monte Carlo simulations based on real observations and its sensitivity is compared to standard methods which do not incorporate PSF information. The gain of significance that can be attributed to the inclusion of the PSF is around 10% and can be boosted if a background model is assumed or a finer binning is used. (C) 2015 Elsevier B.V. All rights reserved.

Item Type:Article
Additional Information:

© 2016 Elsevier Science BV.
This work was supported by the Spanish MINECO under contract FPA2010-22056-C06-06 and MECD under FPU Grant A-2013-12235. The analysis was performed using the open-source tools: ROOT Data Analysis Framework [18], Python and Matplotlib [19].

Uncontrolled Keywords:Gamma ray astronomy; Likelihood ratio; System
Subjects:Sciences > Physics > Nuclear physics
ID Code:35664
Deposited On:17 Feb 2016 15:12
Last Modified:10 Dec 2018 14:57

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