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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2512.24085 |
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| _version_ | 1866908830999248896 |
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| author | Shao, Xueying Gao, He |
| author_facet | Shao, Xueying Gao, He |
| contents | This paper presents simulations of the synchrotron self-Compton (SSC) spectrum within the Internal-Collision-induced Magnetic Reconnection and Turbulence (ICMART) model. We investigate how key parameters like the magnetization $σ_0$ shape the broadband spectral energy distribution by regulating the electron distribution and magnetic field strength. The overall spectrum typically comprises two components: synchrotron radiation peaking at $E_{\rm p}$ with a low-energy spectral index $α$ between -1 and -1.5, and an SSC component peaking at $E_{\rm ssc}$. At high energies, Klein-Nishina suppression causes an exponential cutoff. The flux ratio Y between these components is critical: when Y is small, the SSC peak can be suppressed. Spectral features of the synchrotron component reveal the underlying physical conditions: harder spectra with $α\sim-1$ indicate a large Y parameter and strong KN suppression. We find a positive correlation between Y and $σ_0$, contrasting with internal shock model predictions. Applied to GRB 221009A, our model suggests $σ_0\leq20$ can reproduce the MeV-TeV observations. This study underscores the value of combined MeV-TeV observations in probing GRB emission mechanisms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_24085 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | SSC Radiation in the ICMART Model: Spectral Simulations and Application to the Record-Breaking GRB 221009A Shao, Xueying Gao, He High Energy Astrophysical Phenomena This paper presents simulations of the synchrotron self-Compton (SSC) spectrum within the Internal-Collision-induced Magnetic Reconnection and Turbulence (ICMART) model. We investigate how key parameters like the magnetization $σ_0$ shape the broadband spectral energy distribution by regulating the electron distribution and magnetic field strength. The overall spectrum typically comprises two components: synchrotron radiation peaking at $E_{\rm p}$ with a low-energy spectral index $α$ between -1 and -1.5, and an SSC component peaking at $E_{\rm ssc}$. At high energies, Klein-Nishina suppression causes an exponential cutoff. The flux ratio Y between these components is critical: when Y is small, the SSC peak can be suppressed. Spectral features of the synchrotron component reveal the underlying physical conditions: harder spectra with $α\sim-1$ indicate a large Y parameter and strong KN suppression. We find a positive correlation between Y and $σ_0$, contrasting with internal shock model predictions. Applied to GRB 221009A, our model suggests $σ_0\leq20$ can reproduce the MeV-TeV observations. This study underscores the value of combined MeV-TeV observations in probing GRB emission mechanisms. |
| title | SSC Radiation in the ICMART Model: Spectral Simulations and Application to the Record-Breaking GRB 221009A |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2512.24085 |