Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane
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 Lar...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ada6b2 |
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| _version_ | 1832576319440814080 |
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| author | Jiayin He Houdun Zeng Yi Zhang Qiang Yuan Rui Zhang Jun Li |
| author_facet | Jiayin He Houdun Zeng Yi Zhang Qiang Yuan Rui Zhang Jun Li |
| author_sort | Jiayin He |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-1db40dceded64d80a9fa5d8e97a0606d |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-1db40dceded64d80a9fa5d8e97a0606d2025-01-31T06:56:06ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198011710.3847/1538-4357/ada6b2Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic PlaneJiayin He0Houdun Zeng1https://orcid.org/0000-0001-8500-0541Yi Zhang2Qiang Yuan3https://orcid.org/0000-0003-4891-3186Rui Zhang4Jun Li5Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, People’s Republic of China; zhd@pmo.ac.cn, zhangyi@pmo.ac.cn; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People’s Republic of ChinaKey Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, People’s Republic of China; zhd@pmo.ac.cn, zhangyi@pmo.ac.cn; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People’s Republic of China; Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University , Kunming 650091, People’s Republic of ChinaKey Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, People’s Republic of China; zhd@pmo.ac.cn, zhangyi@pmo.ac.cn; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People’s Republic of ChinaKey Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, People’s Republic of China; zhd@pmo.ac.cn, zhangyi@pmo.ac.cn; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People’s Republic of ChinaKey Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, People’s Republic of China; zhd@pmo.ac.cn, zhangyi@pmo.ac.cn; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People’s Republic of ChinaKey Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, People’s Republic of China; zhd@pmo.ac.cn, zhangyi@pmo.ac.cn; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People’s Republic of ChinaThe 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.https://doi.org/10.3847/1538-4357/ada6b2Gamma-ray astronomyDiffuse radiationCosmic background radiation |
| spellingShingle | Jiayin He Houdun Zeng Yi Zhang Qiang Yuan Rui Zhang Jun Li Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane The Astrophysical Journal Gamma-ray astronomy Diffuse radiation Cosmic background radiation |
| title | Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane |
| title_full | Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane |
| title_fullStr | Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane |
| title_full_unstemmed | Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane |
| title_short | Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane |
| title_sort | contribution of unresolved sources to diffuse gamma ray emission from the galactic plane |
| topic | Gamma-ray astronomy Diffuse radiation Cosmic background radiation |
| url | https://doi.org/10.3847/1538-4357/ada6b2 |
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