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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

First optical validation of a Schwarzschild Couder telescope: the ASTRI SST-2M Cherenkov telescope

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Giro, E. [1, 2] ; Canestrari, R. [2] ; Sironi, G. [2] ; Antolini, E. [3] ; Conconi, P. [2] ; Fermino, C. E. [4] ; Gargano, C. [5] ; Rodeghiero, G. [6, 1] ; Russo, F. [7] ; Scuderi, S. [8] ; Tosti, G. [3] ; Vassiliev, V. [9] ; Pareschi, G. [2]
Total Authors: 13
[1] Osserv Astron Padova, INAF, Vicolo Osservatorio 5, I-35122 Padua - Italy
[2] Osserv Astron Brera, INAF, Via Emilio Bianchi 46, I-23807 Merate, LC - Italy
[3] Univ Perugia, Dipartimento Fis & Geol, Via Pascoli, I-06123 Perugia - Italy
[4] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, 1226 Rua Matao, Sao Paulo - Brazil
[5] IASF Palermo, INAF, Via Ugo La Malfa 153, I-90146 Palermo - Italy
[6] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg - Germany
[7] Osserv Astron Torino, INAF, Via Osservatorio 20, I-10025 Pino Torinese, TO - Italy
[8] Osserv Astrofis Catania, INAF, Via S Sofia 78, I-95125 Catania - Italy
[9] Univ Calif Los Angeles, Dept Phys & Astron, 430 Portola Plaza, Los Angeles, CA 90095 - USA
Total Affiliations: 9
Document type: Journal article
Source: Astronomy & Astrophysics; v. 608, DEC 11 2017.
Web of Science Citations: 4

Context. The Cherenkov Telescope Array (CTA) represents the most advanced facility designed for Cherenkov Astronomy. ASTRI SST-2M has been developed as a demonstrator for the Small Size Telescope in the context of the upcoming CTA. Its main innovation consists in the optical layout which implements the Schwarzschild-Couder configuration and is fully validated for the first time. The ASTRI SST-2M optical system represents the first qualified example of a two-mirror telescope for Cherenkov Astronomy. This configuration permits us to (i) maintain high optical quality across a large field of view; (ii) demagnify the plate scale; and (iii) exploit new technological solutions for focal plane sensors. Aims. The goal of the paper is to present the optical qualification of the ASTRI SST-2M telescope. The qualification has been obtained measuring the point spread function (PSF) sizes generated in the focal plane at various distances from the optical axis. These values have been compared with the performances expected by design. Methods. After an introduction on Gamma-ray Astronomy from the ground, the optical design of ASTRI SST-2M and how it has been implemented is discussed. Moreover, the description of the set-up used to qualify the telescope over the full field of view is shown. Results. We report the results of the first-light optical qualification. The required specification of a flat PSF of similar to 10 arcmin in a large field of view (similar to 10 degrees) has been demonstrated. These results validate the design specifications, opening a new scenario for Cherenkov Gamma-ray Astronomy and, in particular, for the detection of high-energy (5-300 TeV) gamma rays and wide-field observations with CTA. (AU)

FAPESP's process: 13/10559-5 - Investigation of high energy and plasma astrophysics phenomena: theory, numerical simulations, observations, and instrument development for the Cherenkov Telescope Array (CTA)
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Research Projects - Thematic Grants