Abstract
In the framework of the Cherenkov Telescope Array (CTA) Observatory, the Italian National Institute of Astrophysics (INAF) has recently inaugurated in Sicily (Italy), at the Serra La Nave astronomical site on the slopes of Mount Etna, a large field of view (FoV, ~ 9.6°) dual-mirror prototype (ASTRI SST-2M) of the CTA small size class of telescopes (SST). The CTA plans to install about 70 SST in the southern site to allow the study of the gamma rays from a few TeV up to hundreds of TeV. The ASTRI SST-2M telescope prototype has been developed following an end-to-end approach, since it includes the entire system of structure, mirrors optics (primary and secondary mirrors), camera, and control/acquisition software. A remarkable performance improvement could come from the operation of the ASTRI mini-array, led by INAF in synergy with the Universidade de Sao Paulo (Brazil) and the North-West University (South Africa). The ASTRI mini-array will be composed of nine ASTRI SST-2M units and it is proposed as a precursor and initial seed of the CTA to be installed at the final CTA southern site. Apart from the assessment of a number of technological aspects related to the CTA, the ASTRI mini-array will, if compared for instance to H.E.S.S., extend the point source sensitivity up to ~ 100 TeV, also improving it above 5-10 TeV. Moreover, the unprecedented width of the FoV, with its homogeneous acceptance and angular resolution, will significantly contribute to the achievement of original results during the early CTA science phase.
Highlights
The very high-energy (VHE, Eγ 50 GeV) portion of the electromagnetic spectrum is currently being investigated by means of ground-based imaging atmospheric Cherenkov telescopes (IACTs, see [1] for a recent review)
The ASTRI mini-array is proposed to be deployed to the Cherenkov Telescope Array (CTA)-South site once it is established, being likely commissioned in 2017 and beginning its verification phase in 2018
The combination of the sensitivity extended to 100 TeV and of the homogeneous performance across the field of view (FoV) will allow us to study the VHE (E≥ 10 TeV) emission from extended source such as SNRs and PWN, and to investigate the presence of spectral cutoffs
Summary
The very high-energy (VHE, Eγ 50 GeV) portion of the electromagnetic spectrum is currently being investigated by means of ground-based imaging atmospheric Cherenkov telescopes (IACTs, see [1] for a recent review). In order to dramatically boost the current IACT performance and to widen the VHE science, a new Cherenkov telescope array (CTA) has been proposed, as described in [2]. Two such arrays will be built at ± 30◦ latitudes, in order to monitor the whole sky, and will be operated as an observatory open to the world-wide astronomical community. The wide energy range covered by the CTA (from a few tens of GeV to above 100 TeV) requires different kinds of telescopes. 70 small size telescopes (SST, primary mirror D∼ 4 m, Aeff ∼ 5 − 10 m2) covering
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