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Title:Performance of the Cherenkov Telescope Array in the presence of clouds
Authors:ID Pecimotika, Mario (Author)
ID Bhattacharyya, Saptashwa (Author)
ID MARČUN, Barbara (Author)
ID Pérez Romero, Judit (Author)
ID Stanič, Samo (Author)
ID Vodeb, Veronika (Author)
ID Vorobiov, Serguei (Author)
ID Zaharijas, Gabrijela (Author)
ID Zavrtanik, Marko (Author)
ID Zavrtanik, Danilo (Author)
ID Živec, Miha (Author), et al.
Files:.pdf ICRC2021_773.pdf (980,51 KB)
MD5: 97A4CCAB7F445AF7E6A98F78D01E99A3
 
URL https://pos.sissa.it/395/
 
URL https://pos.sissa.it/395/773/pdf
 
Language:English
Work type:Not categorized
Typology:1.08 - Published Scientific Conference Contribution
Organization:UNG - University of Nova Gorica
Abstract:The Cherenkov Telescope Array (CTA) is the future ground-based observatory for gamma-ray astronomy at very high energies. The atmosphere is an integral part of every Cherenkov telescope. Di˙erent atmospheric conditions, such as clouds, can reduce the fraction of Cherenkov photons produced in air showers that reach ground-based telescopes, which may a˙ect the performance. Decreased sensitivity of the telescopes may lead to misconstructed energies and spectra. This study presents the impact of various atmospheric conditions on CTA performance. The atmospheric transmission in a cloudy atmosphere in the wavelength range from 203 nm to 1000 nm was simulated for di˙erent cloud bases and di˙erent optical depths using the MODerate resolution atmospheric TRANsmission (MODTRAN) code. MODTRAN output files were used as inputs for generic Monte Carlo simulations. The analysis was performed using the MAGIC Analysis and Reconstruction Software (MARS) adapted for CTA. As expected, the e˙ects of clouds are most evident at low energies, near the energy threshold. Even in the presence of dense clouds, high-energy gamma rays may still trigger the telescopes if the first interaction occurs lower in the atmosphere, below the cloud base. A method to analyze very high-energy data obtained in the presence of clouds is presented. The systematic uncertainties of the method are evaluated. These studies help to gain more precise knowledge about the CTA response to cloudy conditions and give insights on how to proceed with data obtained in such conditions. This may prove crucial for alert-based observations and time-critical studies of transient phenomena.
Keywords:Cherenkov Telescope Array, very-high energy gamma rays, MODerate resolution atmospheric TRANsmission code, MAGIC Analysis and Reconstruction Software
Publication status:Published
Year of publishing:2021
PID:20.500.12556/RUNG-8428 New window
COBISS.SI-ID:164827395 New window
NUK URN:URN:SI:UNG:REP:IE4AHGNN
Publication date in RUNG:18.09.2023
Views:729
Downloads:4
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Record is a part of a monograph

Title:37th International Cosmic Ray Conference : ICRC2021
Place of publishing:Trst, Italija
Year of publishing:2021

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:P1-0031
Name:Večglasniška astrofizika

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

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