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Title: Gamma-ray source observations with the HAGAR telescope system at Hanle in the Himalayas
Authors: Britto, R. J
Acharya, B. S
Chitnis, V. R
Cowsik, R
Dorji, N
Duhan, S. K
Gothe, K. S
Kamath, P. U
Mahesh, P. K
Nagesh, B. K
Naidu, A
Parmar, N. K
Prabhu, T. P
Rao, S. K
Saha, L
Saleem, F
Saxena, A. K
Sharma, S. K
Shukla, A
Singh, B. B
Srinivasan, R
Srinivasulu, G
Sudersanan, P. V
Tsewang, D
Upadhya, S. S
Vishwanath, P. R
Keywords: Gamma-Ray Source Observations;Crab Nebula;HAGAR Telescope;Relatively Low Threshold;Gamma-Ray Signal;Gamma-Ray Flux
Issue Date: Nov-2009
Publisher: Societe Francaise d’Astronomie et dAstrophysique
Citation: Heydari-Malayeri, M., Reylé, C. and Samadi, R., eds., SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in Besançon, France, pp. 131 - 134
Abstract: We have observed Crab nebula using the recently commissioned wavefront sampling high alti- tude (4270 m) array, HAGAR, at Hanle in the Ladakh region of the Himalayas. Regular source observations have begun with the complete setup of 7 telescopes since Sept. 2008. HAGAR is the first array of atmo- spheric Cherenkov telescopes established at a so high altitude and was designed to reach a relatively low threshold with quite a low mirror area (31 m 2). Estimation of the sensitivity of the experiment is undergoing using several hours of data from the direction of Crab nebula, the standard candle source of TeV gamma-ray astronomy. Data were acquired using the On-source/Off-source mode and by comparing these sky regions the strength of the gamma-ray signal could be estimated. Gamma-ray events arrive close to telescope axis direction while the cosmic-ray background events arrive from the whole field of view. We discuss our anal- ysis procedures for the estimate of arrival direction, estimate of gamma-ray flux from Crab nebula and the sensitivity of the HAGAR system etc in this paper. Also preliminary results on blazars 1es2344+514 and Mkn421 will be presented.
Description: Open Access
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