Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane

被引：0
|
作者：
He, Jiayin [1 ,2 ]
Zeng, Houdun [1 ,2 ,3 ]
Zhang, Yi [1 ,2 ]
Yuan, Qiang [1 ,2 ]
Zhang, Rui [1 ,2 ]
Li, Jun [1 ,2 ]
机构：
[1] Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210023, Peoples R China
[2] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
[3] Yunnan Univ, Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2025年 / 980卷 / 01期
基金：
中国国家自然科学基金;
关键词：
RADIATION; ENERGIES; LIGHT;
D O I：
10.3847/1538-4357/ada6b2
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The diffuse gamma-ray emission from the Milky Way serves as a crucial probe for understanding the propagation and interactions of cosmic rays within our Galaxy. The Galactic diffuse gamma-ray emission between 10 TeV and 1 PeV has been recently measured by the square kilometer array (KM2A) of the Large High Altitude Air Shower Observatory (LHAASO). The flux is higher than predicted for cosmic rays interacting with the interstellar medium. In this work, we utilize a nonparametric method to derive the source count distribution using the published first LHAASO source catalog. Based on this distribution, we calculate the contribution of unresolved sources to the diffuse emission measured by KM2A. When comparing our results to the measured diffuse gamma-ray emission, we demonstrate that for the outer Galactic region, the contributions from unresolved sources and those predicted by models are roughly consistent with the observations within the uncertainties. However, for the inner Galactic region, additional components are required to account for the observed data.
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页数：7
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