Speaker
Description
The first source catalog of the Large High Altitude Air Shower Observatory (LHAASO) reported
90 very-high-energy gamma-ray sources [1], providing a comprehensive view of the TeV–PeV sky.
With an expanded dataset, we perform an updated analysis to demonstrate how increased statis-
tics reveal changes in source morphology and resolve finer emission structures.
In this work, we focus on a representative subregion ( 48◦ < l < 62◦
,−5◦ < b < 5◦) of the sky
to highlight the differences between the new catalog and the first LHAASO catalog. This region
includes both isolated and complex emission structures, enabling a detailed comparison of source
significance, spectral properties, and morphology.
The results show that increased statistics enhance detection sensitivity, allowing weaker emis-
sion components to emerge and previously reported sources to be characterized with better preci-
sion. In several cases, the improved dataset reveals more complex structures and better separation
of nearby sources.
This study illustrates the scientific improvements enabled by extended LHAASO observations
and provides insight into the expected advances in future for second LHAASO source catalog.
References
[1] Zhen Cao et al. The First LHAASO Catalog of Gamma-Ray Sources. Astrophys. J. Suppl.,
271(1):25, 2024.
