GeV gamma-ray emission in the field of young massive star cluster RCW 38
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866914731987566592 |
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| author | Ge, Ting-Ting Sun, Xiao-Na Yang, Rui-Zhi Tam, Pak-Hin Thomas Lu, Ming-Xuan Liang, En-Wei |
| author_facet | Ge, Ting-Ting Sun, Xiao-Na Yang, Rui-Zhi Tam, Pak-Hin Thomas Lu, Ming-Xuan Liang, En-Wei |
| contents | We report the detection of gamma-ray emission by the Fermi Large Area Telescope (Fermi-LAT) towards the young massive star cluster RCW 38 in the 1-500 GeV photon energy range. We found spatially extended GeV emission towards the direction of RCW 38, which is best modelled by a Gaussian disc of 0.23$°$ radius with a significance of the extension is $\sim 11.4 σ$. Furthermore, the spatial correlation with the ionized and molecular gas content favors the hadronic origin of the gamma-ray emission. The gamma-ray spectrum of RCW 38 has a relatively hard photon index of $2.44 \pm 0.03$, which is similar to other young massive star clusters. We argue that the diffuse GeV gamma-ray emission in this region likely originates from the interaction of accelerated protons in the stellar cluster with the ambient gas. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_19362 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | GeV gamma-ray emission in the field of young massive star cluster RCW 38 Ge, Ting-Ting Sun, Xiao-Na Yang, Rui-Zhi Tam, Pak-Hin Thomas Lu, Ming-Xuan Liang, En-Wei High Energy Astrophysical Phenomena We report the detection of gamma-ray emission by the Fermi Large Area Telescope (Fermi-LAT) towards the young massive star cluster RCW 38 in the 1-500 GeV photon energy range. We found spatially extended GeV emission towards the direction of RCW 38, which is best modelled by a Gaussian disc of 0.23$°$ radius with a significance of the extension is $\sim 11.4 σ$. Furthermore, the spatial correlation with the ionized and molecular gas content favors the hadronic origin of the gamma-ray emission. The gamma-ray spectrum of RCW 38 has a relatively hard photon index of $2.44 \pm 0.03$, which is similar to other young massive star clusters. We argue that the diffuse GeV gamma-ray emission in this region likely originates from the interaction of accelerated protons in the stellar cluster with the ambient gas. |
| title | GeV gamma-ray emission in the field of young massive star cluster RCW 38 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2403.19362 |