# Detection prospects of Very and Ultra High-Energy gamma rays from extended sources with ASTRI, CTA, and LHAASO

**Authors:** Silvia Celli, Giada Peron  
**arXiv:** [2403.03731](https://arxiv.org/abs/2403.03731)  
**Date:** 2024-03-06  
**Summary page:** https://www.summarizepaper.com/en/paper/2403.03731v1/

## Key points

- Study focuses on ultra high-energy gamma-ray emitters within our Galaxy
- Importance of detailed spectral and morphological studies to pinpoint locations of high-energy particle generation
- Many observed sources found to be significantly extended, highlighting need for comprehensive investigations
- Leveraging advanced technologies like CTA Observatory and ASTRI Mini-Array for analysis
- Both ASTRI and CTA show potential in detecting a wide range of gamma-ray emitters within our Galaxy
- Promising targets identified for future observations based on performance capabilities
- Specific classes of sources explored, including passive molecular clouds and pulsars surrounded by runaway particles
- Aim is to gain deeper insights into origins and properties of ultra high-energy gamma-ray emissions in our Galaxy

## Summary

In the recent study by Silvia Celli and Giada Peron, titled "Detection prospects of Very and Ultra High-Energy gamma rays from extended sources with ASTRI, CTA, and LHAASO," the authors delve into the exciting realm of ultra high-energy gamma-ray emitters within our Galaxy. This discovery marks a significant step forward in unraveling the mysteries of the most powerful accelerators in our cosmic neighborhood. The researchers emphasize the importance of detailed spectral and morphological studies to pinpoint the exact locations where these high-energy particles are generated and to comprehend the underlying physical mechanisms at play. Most notably, many of the observed sources were found to be significantly extended, further highlighting the need for comprehensive investigations. To address these challenges, the study focuses on leveraging advanced technologies such as next-generation Imaging Atmospheric Cherenkov Telescopes like the Cherenkov Telescope Array (CTA) Observatory and the ASTRI Mini-Array (ASTRI). By conducting a comparative analysis of their performance capabilities, including differential sensitivities towards extended sources, the researchers aim to identify promising targets for future observations. The results of their analysis reveal that both ASTRI and CTA show great potential in detecting a wide range of gamma-ray emitters within our Galaxy. Specifically, almost all sources previously detected by LHAASO-WCDA and HGPS are within reach of ASTRI and CTA with varying exposure times. Additionally, for the highest energy emitters identified by LHAASO-KM2A, a list of particularly promising objects is provided for further investigation. Furthermore, specific classes of sources are explored in detail to identify potentially detectable gamma-ray emitters. These include passive molecular clouds illuminated by cosmic rays and pulsars surrounded by halos of runaway particles. By targeting these distinct types of sources, researchers hope to gain deeper insights into the origins and properties of ultra high-energy gamma-ray emissions in our Galaxy. Overall, this study offers a comprehensive overview of the detection prospects for very and ultra high-energy gamma rays from extended sources using cutting-edge telescopes like ASTRI, CTA, and LHAASO. The findings pave the way for future observational campaigns aimed at unraveling the mysteries surrounding some of nature's most powerful particle accelerators.