Detection prospects of Very and Ultra High-Energy gamma rays from extended sources with ASTRI, CTA, and LHAASO
arxiv(2024)
摘要
Context. The recent discovery of several ultra high-energy gamma-ray emitters
in our Galaxy constitutes a significant advancement towards unveiling its most
powerful accelerators and their properties. Nonetheless, in order to
unambiguously locate the regions where the highest energy particles are
produced and understand the responsible physical mechanisms, detailed spectral
and morphological studies are required, especially given that most of the
observed sources were found to be significantly extended. Aims. In these
regards, pointing observations with the next-generation Imaging Atmospheric
Cherenkov Telescopes, like the Cherenkov Telescope Array (CTA) Observatory and
the ASTRI Mini-Array (ASTRI), are expected to provide significant improvements.
Here we aim at identifying the most promising sources to target in future
observations. Methods. To this purpose, we performed a comparative analysis of
the expected performance of ASTRI and CTA, computing their differential
sensitivities towards extended sources, and further explored their capabilities
with respect to specific case studies, including follow-ups of existing
gamma-ray source catalogs. Results. We find that almost all of the sources so
far detected by LHAASO-WCDA and HGPS will be in the reach of ASTRI and CTA with
300 and 50 hours of exposure, respectively. For the highest energy emitters
detected by LHAASO-KM2A, in turn, we provide the list of the most promising
objects to be investigated. We further examined specific classes of sources in
order to identify potentially detectable gamma-ray emitters, such as passive
molecular clouds (i.e. illuminated by the cosmic-ray sea) and pulsars
surrounded by a halo of runaway particles.
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