Investigation of the Ultra High Energy gamma-ray emission from the North Fermi Bubble with LHAASO-KM2A
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July 25, 2023
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Abstract
We analyze gamma-ray emission from the Northern Fermi bubble region at the ultra-high-energy range, using the data collected by LHAASO-KM2A from December 2019 to September 2022. Employing an improved gamma/hadron separation method, the median energy of the gamma rays is above 25\ TeV. We perform the “direct integral method” in the background estimation; however, no significant excess is observed. Consequently, we present the expected upper limits for gamma-ray emissions within the Fermi bubble region at this energy range.
DOI: https://doi.org/10.22323/1.444.0651
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.