Abstract The search for photon sources emitting at energies greater than few hundreds GeV is performed with ground based detectors, either imaging atmospheric cherenkov tele-scopes and air showers detectors. The latter are limited in energy and angular resolution but offer a wide angle field of view and a high duty cycle. The two currently operating air showers arrays are LHAASO and HAWC, both located in the northern hemisphere, the southern hemisphere sky is currently not covered by such an observatory. The goal of the SWGO collaboration is the construction of a wide field of view, high duty cycle observatory to explore the Southern hemisphere sky searching for gamma ray sources at energies above 100 GeV. Such an array will detect particles of the extensive air showers and select the photon originated showers rejecting the background due to the hadronic ones. To observe the galactic plane at small zentih angles and to have a energy detection threshold as low as 100 GeV, the experiment should be located at latitude between 10° and 30° degrees south and at an altitude above 4400 m a.s.l.. The baseline detection technique chosen by the collaboration is Water Cherenkov Detectors.
A. Chiavassa (Tue,) studied this question.