Exploring the circumstellar environment of Tycho's supernova remnant. II. Impact on the broadband non-thermal emission
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| Format: | Preprint |
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2024
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| _version_ | 1866910736103505920 |
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| author | Kobashi, Ryosuke Lee, Shiu-Hang Tanaka, Takaaki Maeda, Keiichi |
| author_facet | Kobashi, Ryosuke Lee, Shiu-Hang Tanaka, Takaaki Maeda, Keiichi |
| contents | While the environment around Tycho's supernova remnant (SNR) has long been believed to be close to homogeneous, the latest analysis of Chandra data has identified a substantial deceleration of the forward shock which poses a major challenges to this picture. arXiv:2310.14841 showed that the existence of dense molecular cloud (MC) surrounding a rarefied wind-like circumstellar matter (CSM) can explain this observational finding in term of the shock-expansion dynamics, supporting the so-called single-degenerate scenario for the progenitor system. We here extend this work to study the non-thermal emission processes and investigate whether such an environment is consistent with the observed multi-wavelength spectrum. While the simulated broadband spectrum based on the wind-MC environment is largely consistent with observations, we find that such an environment predicts a harder gamma-ray spectrum than observed due to the relatively low CSM density in the cavity interior of the MC. This difference can be at least partially attributed to the present one-dimensional setup of the model which does not account for the clumpy and multi-dimensional structure of the CSM. Our model provides predictions for the long-term evolution of the broadband spectrum which can be used to further probe Tycho's surrounding environment in the future, a key to resolving the long-standing issue of type Ia supernova progenitor channels. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_07130 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exploring the circumstellar environment of Tycho's supernova remnant. II. Impact on the broadband non-thermal emission Kobashi, Ryosuke Lee, Shiu-Hang Tanaka, Takaaki Maeda, Keiichi High Energy Astrophysical Phenomena High Energy Physics - Phenomenology While the environment around Tycho's supernova remnant (SNR) has long been believed to be close to homogeneous, the latest analysis of Chandra data has identified a substantial deceleration of the forward shock which poses a major challenges to this picture. arXiv:2310.14841 showed that the existence of dense molecular cloud (MC) surrounding a rarefied wind-like circumstellar matter (CSM) can explain this observational finding in term of the shock-expansion dynamics, supporting the so-called single-degenerate scenario for the progenitor system. We here extend this work to study the non-thermal emission processes and investigate whether such an environment is consistent with the observed multi-wavelength spectrum. While the simulated broadband spectrum based on the wind-MC environment is largely consistent with observations, we find that such an environment predicts a harder gamma-ray spectrum than observed due to the relatively low CSM density in the cavity interior of the MC. This difference can be at least partially attributed to the present one-dimensional setup of the model which does not account for the clumpy and multi-dimensional structure of the CSM. Our model provides predictions for the long-term evolution of the broadband spectrum which can be used to further probe Tycho's surrounding environment in the future, a key to resolving the long-standing issue of type Ia supernova progenitor channels. |
| title | Exploring the circumstellar environment of Tycho's supernova remnant. II. Impact on the broadband non-thermal emission |
| topic | High Energy Astrophysical Phenomena High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2412.07130 |