Observations of Cosmic TeV Gamma-Rays in the Southern Sky by Means of Stereoscopic and Timing Analyses of Cherenkov Light

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmic Rays, Gamma Rays, Imaging Techniques, Time Measurement, Observation, Australia, Cameras, Photons, Radio Galaxies, Southern Sky, Telescopes

Scientific paper

A search for TeV gamma-rays from the pulsares PSR B1706-44 and PSR B1055-52 and from the radio galaxy Centaurus A were made as a project of the CANGAROO collaboration with two atmospheric Cherenkov telescopes, the 3.8 m telescope and the BlGRAT, at Woomera, Australia in 1994 and 1995. The times of observations were 27 hours, 69 hours and 57 hours, respectively. Stereoscopic analysis and timing analysis in addition to the imaging technique have been applied to the observational data. Two images of Cherenkov light from one shower detected with the two telescopes equipped with different resolution cameras have been utilized in the stereoscopic analysis. In the timing analysis the arrival direction of the shower have been determined from the fact that the arrival time of a Cherenkov photon on the detector depends upon the direction of the photon. The improvement of S/N by using the stereoscopic analysis and timing analysis has been shown in the case of observational data of PSR B1706-44. The S/N of 0.16 obtained by the imaging technique has been improved to 0.91 by using the stereoscopic and timing analyses. This improvement reduces the necessary time for observation by a factor of 4.

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