Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-08-28
27th International Cosmic Ray Conference, Hamburg (Germany), 2001
Astronomy and Astrophysics
Astrophysics
4 pages, 3 Postscript figures, 3 jpeg figures; uses icrc.cls
Scientific paper
Pachmarhi Array of \v{C}erenkov Telescopes (PACT) has been designed to search for celestial TeV $\gamma-$rays using the wavefront sampling technique. PACT, located at Pachmarhi, (latitude 22$^\circ$ 28$^\prime$ N, longitude 76$^\circ$ 26$^\prime$ E, altitude 1075 m) consists of 25 telescopes deployed over an area of 80 m $\times$ 100m. Each telescopes consists of 7 parabolic reflectors, each viewed by a fast phototube behind a 3$^\circ$ mask at the focus. The density and the arrival time of the photons at the PMT are recorded for each shower. The energy threshold and collection area of the array are estimated, from Monte Carlo simulations, to be $\sim$ 900 GeV and 10$^5$ m$^2$ respectively. The accuracy in determination of arrival angle of a shower is estimated to be about 0.1$^\circ$ in the near vertical direction. About 99% of the off-axis hadronic events could be rejected from directional information alone. Further, at least 75% of the on-axis hadronic events could be rejected using species sensitive parameters derived from timing and density measurements. These cuts on data to reject background would retain $\sim$ 44% of the $\gamma-$ray signal. The sensitivity of the array for a 5$\sigma$ detection of $\gamma-$ray signal at a threshold energy of 1 TeV has been estimated to be $\sim$ 4.1 $\times$ 10$^{-12}$ photons cm$^{-2}$ s$^{-1}$ for an on source exposure of 50 hours. The PACT set-up has been fully commissioned and is collecting data. The details of the system parameters and sensitivity will be presented.
Abdel Rahman A.-M. M.
Acharya Bobby Samir
Bhat Narayan P.
Chitnis Varsha R.
Gothe K. S.
No associations
LandOfFree
Pachmarhi Array of Čerenkov Telescopes and its Sensitivity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Pachmarhi Array of Čerenkov Telescopes and its Sensitivity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pachmarhi Array of Čerenkov Telescopes and its Sensitivity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-101507