CTA: the future of ground-based gamma-ray astrophysics

TL;DR

The paper discusses the Cherenkov Telescope Array (CTA), a next-generation ground-based gamma-ray observatory with significantly improved sensitivity and energy range, advancing astrophysical research into high-energy cosmic phenomena.

Contribution

It introduces the CTA project, detailing its technical design, expected performance improvements, and current development status for ground-based gamma-ray astrophysics.

Findings

CTA will have 10 times better sensitivity than current telescopes.

It will extend gamma-ray observations from 30 GeV to 300 TeV.

The project is progressing with specific technical solutions outlined.

Abstract

Very high energy (VHE; E > 100 GeV) gamma-rays provide a unique probe into the non-thermal processes in the universe. The ground-based Imaging Air Cherenkov telescopes (IACTs) for detecting VHE gamma-rays have been perfected, so a relatively fast and inexpensive assembly of IACTs is now possible. Next generation instruments will have a sensitivity about 10 times better than current facilities, and will extend the accessible gamma-ray bandwidth at both energy ends (down to 30 GeV and up to 300 TeV) with improved angular and energy resolutions. Some key physics drivers, that are discussed here, suit specific features of the upcoming IACT facility, the Cherenkov Telescope Array (CTA). The resulting technical solutions chosen for CTA, and the current status of the project, are also outlined.