Angular resolution of the Pachmarhi array of Čerenkov telescopes

Majumdar, P.; Acharya, B. S.; Bhat, P. N.; Chitnis, V. R.; Rahman, M. A.; Singh, B. B.; Vishwanath, P. R.

doi:10.1016/s0927-6505(02)00148-2

Cited by 9 publications

(9 citation statements)

References 24 publications

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“…The altitude of HA-GAR experiment at Hanle (longitude: 78 o 57 ′ 51 ′′ E, latitude: 32 o 46 ′ 46 ′′ N, altitude: 4270 m) [10] is used as the observational level in the generation of all these showers. However, to demonstrate the altitude effect in our study, we have also generated the showers using QGSJET-GHEISHA combination only over the Pachmarhi observation level (longitude: 78 o 26 ′ E, latitude: 22 o 28 ′ N, altitude: 1075 m), the site of PACT experiment [11]. Apart from all these showers, for specific purposes mentioned in the concerned sections, some more showers are generated for the Hanle observation level by using the VENUS-GHEISHA combination also.…”

Section: Simulation Of Atmospheric Cherenkov Photonsmentioning

confidence: 99%

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Lateral density and arrival time distributions of Cherenkov photons in extensive air showers: A simulation study

Hazarika

Goswami

Chitnis

et al. 2015

Astroparticle Physics

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We have investigated some features of the density and arrival time distributions of Cherenkov photons in extensive air showers using the CORSIKA simulation package. The main thrust of this study is to see the effect of hadronic interaction models on the production pattern of Cherenkov photons with respect to distance from the shower core. Such studies are very important in ground based γ-ray astronomy for an effective rejection of huge cosmic ray background, where the atmospheric Cherenkov technique is being used extensively within the energy range of some hundred GeV to few TeV. We have found that for all primary particles, the density distribution patterns of Cherenkov photons follow the negative exponential function with different coefficients and slopes depending on the type of primary particle, its energy and the type of interaction model combinations. Whereas the arrival time distribution patterns of Cherenkov photons follow the function of the form t(r) = t0ewith different values of the function parameters. There is no significant effect of hadronic interaction model combinations on the density and arrival time distributions for the γ-ray primaries. However, for the hadronic showers, the effects of the model combinations are significant under different conditions.

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Section: Simulation Of Atmospheric Cherenkov Photonsmentioning

confidence: 99%

“…So we have an array of 17×21 i.e. 357 telescopes covering an area of 400 m×400 m, which is equivalent to several 25 telescope sectors identical to PACT experiment [11]. Thus we have selected this detector geometry keeping in view of our earlier simulation works [5].…”

Section: Simulation Of Atmospheric Cherenkov Photonsmentioning

confidence: 99%

Lateral density and arrival time distributions of Cherenkov photons in extensive air showers: A simulation study

Hazarika

Goswami

Chitnis

et al. 2015

Astroparticle Physics

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“…Typical trigger rate was about 1-3 Hz per sector. The details of this array are given in (Bhat et al 2000, Majumdar et al 2003.…”

Section: Tev Observations With Pactmentioning

confidence: 99%

“…• (Majumdar et al 2003). Normalization of distributions corresponding to the background with that of the source is necessary as these two data sets were taken at different times.…”

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confidence: 99%

Simultaneous Multi-Wavelength Observations of the TeV Blazar Mrk 421 during February–March, 2003: X-Ray and NIR Correlated Variability

Gupta

Acharya

Bose

et al. 2008

Chin. J. Astron. Astrophys.

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In the present paper, we have reported the result of simultaneous multi-wavelength observations of the TeV blazar Mrk 421 during February − March 2003. In this period, we have observed Mrk 421 using Pachmarhi Array ofČerenkov Telescopes (PACT) of Tata Institute of Fundamental Research at Pachmarhi, India. Other simultaneous data were taken from the published literature and public data archives. We have analyzed the high quality X-ray (2-20 keV) observations from the NASA Rossi X-Ray Timing Explorer (RXTE). We have seen a possible correlated variability between X-ray and J band (1.25 µ) near infrared (NIR) wavelength. This is the first case of X-ray and NIR correlated variability in Mrk 421 or any high energy peaked (HBL) blazar. The correlated variability reported here is indicating a similar origin for NIR and X-ray emission. The emission is not affected much by the environment of the surrounding medium around the central engine of the Mrk 421. The observations are consistent with the shock-in-jet model for the emission of radiations.

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“…Photomultiplier tube (PMT), mounted at the focus of the light collector, and converts the light to electrical signal. The shape of the PMT pulse depends on the density and the arrival time distribution of Cherenkov photons and on the response of the detector elements [1][2][3] [4] .…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Analysis of Adaptive Discriminator

2016

IJSR

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Nuclear and High Energy Physics experiments often deal with a large number of detectors. These detectors give out analog signals depicting several parameters like time of arrival, amplitude and width of these analog signals, and pulse count rate etc. Usually, fast discriminators are used to convert these analog signals to digital form, crossing a set threshold. We have designed and developed 8 channel leading edge fast adaptive discriminator module with independent programmable threshold. This module is developed on a CAMAC (IEEE 583) standard for programmability. We discuss the design aspects as well as the performance of a prototype module in this paper.

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Angular resolution of the Pachmarhi array of Čerenkov telescopes

Cited by 9 publications

References 24 publications

Lateral density and arrival time distributions of Cherenkov photons in extensive air showers: A simulation study

Lateral density and arrival time distributions of Cherenkov photons in extensive air showers: A simulation study

Simultaneous Multi-Wavelength Observations of the TeV Blazar Mrk 421 during February–March, 2003: X-Ray and NIR Correlated Variability

Design and Performance Analysis of Adaptive Discriminator

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