Intensity Interferometry with the H.E.S.S. telescopes

          @misc{ scivideos_PIRSA:24100093,
            doi = {10.48660/24100093},
            url = {https://pirsa.org/24100093},
            author = {Vogel, Naomi},
            keywords = {Cosmology},
            language = {en},
            title = {Intensity Interferometry with the H.E.S.S. telescopes},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2024},
            month = {oct},
            note = {PIRSA:24100093 see, \url{https://scivideos.org/index.php/pirsa/24100093}}
          }
          

Abstract

Intensity Interferometry (II) is a method that can achieve high angular resolution and was first employed in the 1960s by Robert Brown and Richard Q. Twiss (HBT). Since then, significant advancements have been made, particularly in the construction of telescopes with large light collection areas, such as Imaging Atmospheric Cherenkov Telescopes (IACTs), exemplified by instruments like H.E.S.S. , MAGIC and VERITAS. Our II setup was designed to be mounted on the lid of the Phase I H.E.S.S. telescopes in Namibia. In April 2022, our first observation campaign was conducted, during which two telescopes operated in a single wavelength band. In April-May 2023, a third telescope was added, and observations were performed in two colors simultaneously for the first time in II. In this contribution I will introduce our setup and compare the different configurations, as well as present the latest results of four southern hemisphere stars.