Detection of the extended $γ$-ray emission from the new supernova remnant G321.3-3.9 with Fermi-LAT
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866916462126432256 |
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| author | Guo, Xiaolei Liu, Xi |
| author_facet | Guo, Xiaolei Liu, Xi |
| contents | With the 15 yrs of Pass 8 data recorded by the {\em Fermi} Large Area Telescope, we report the detection of an extended gigaelectronvolt emission component with a 68\% containment radius of $0^{\circ}\!.85$, which is spatially associated with the newly identified supernova remnant (SNR) G321.3-3.9. The $γ$-ray spectrum is best described by a log-parabola model in the energy range of 100 MeV - 1 TeV, which shows a significant spectral curvature at $\sim$ 1 GeV. Either a leptonic or a hadronic model could explain the multi-wavelength data of G321.3-3.9, while the leptonic model predicts a too low strength of magnetic field. Also considering the flat radio spectrum of G321.3-3.9 and the $γ$-ray upper limit in the low energy band, the hadronic model is favored. The spatial coincidence between the $γ$-ray morphology and the diffuse thermal X-ray emission of G321.3-3.9 and the curved gigaelectronvolt $γ$-ray spectrum of it make G321.3-3.9 to be similar to the typical middle-aged SNRs interacting with molecular clouds. Such characteristics provide another evidence of the potential hadronic origin for its $γ$-ray emission. While there is no molecular cloud detected around G321.3-3.9, which challenges the hadronic model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_23572 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Detection of the extended $γ$-ray emission from the new supernova remnant G321.3-3.9 with Fermi-LAT Guo, Xiaolei Liu, Xi High Energy Astrophysical Phenomena With the 15 yrs of Pass 8 data recorded by the {\em Fermi} Large Area Telescope, we report the detection of an extended gigaelectronvolt emission component with a 68\% containment radius of $0^{\circ}\!.85$, which is spatially associated with the newly identified supernova remnant (SNR) G321.3-3.9. The $γ$-ray spectrum is best described by a log-parabola model in the energy range of 100 MeV - 1 TeV, which shows a significant spectral curvature at $\sim$ 1 GeV. Either a leptonic or a hadronic model could explain the multi-wavelength data of G321.3-3.9, while the leptonic model predicts a too low strength of magnetic field. Also considering the flat radio spectrum of G321.3-3.9 and the $γ$-ray upper limit in the low energy band, the hadronic model is favored. The spatial coincidence between the $γ$-ray morphology and the diffuse thermal X-ray emission of G321.3-3.9 and the curved gigaelectronvolt $γ$-ray spectrum of it make G321.3-3.9 to be similar to the typical middle-aged SNRs interacting with molecular clouds. Such characteristics provide another evidence of the potential hadronic origin for its $γ$-ray emission. While there is no molecular cloud detected around G321.3-3.9, which challenges the hadronic model. |
| title | Detection of the extended $γ$-ray emission from the new supernova remnant G321.3-3.9 with Fermi-LAT |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2410.23572 |