通过光强子模型解读极端高频峰BL Lac天体甚高能伽马射线谱
Deciphering the VHE gamma-rays spectra of Extreme High-Frequency peaked BL Lac Objects through a Photohadronic Model
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中文总结 AI 辅助
该研究利用光强子模型分析15个EHBL源的22个甚高能伽马射线谱，验证模型适用性并分类，同时约束红移，提出H 2356-309为新子类。
中文摘要 AI 辅助
极端高频峰BL Lac天体（EHBLs）其同步辐射峰值位于约1 keV以上，而其逆康普顿峰值延伸至数个TeV。由于EHBLs的低光度，这些天体常常未被探测到，因此目前已知的仅有少数，导致人们对它们的了解甚少。我们采用光强子模型并考虑河外背景光修正，分析了15个EHBL源在不同时期观测到的22个甚高能（VHE）伽马射线谱。我们发现所采用的光强子模型能够充分描述观测到的VHE谱能量分布，并进一步根据光子谱指数δ的值对它们进行分类。同时，利用同一光强子模型严格约束了EHBL HESS J1943+213的红移。在样本中，多数耀发时段属于高发射态，其次是低发射态和甚高发射态。这些耀发时段的占比仅表征当前样本，而非整个EHBL群体。鉴于EHBL H 2356-309的VHE伽马射线谱的异常行为，我们建议将其视为EHBL的一个新子类，该子类在不同耀发时段具有硬且非常软的内禀谱。
英文摘要
Extreme high-frequency peaked BL Lac objects (EHBLs) have their synchrotron peak above $\sim 1$ keV and their inverse Compton peak extends up to several TeVs. Due to low luminosity of EHBLs, these objects are often undetected, and only a small number of them are thus known. As a result, they are poorly understood. Using a photohadronic model and including extragalactic background light correction we analyzed 22 very high-energy (VHE) gamma-ray spectra of 15 EHBL sources observed in different periods. We find that the photohadronic model used can adequately describe the observed VHE spectral energy distribution and furthermore, we classify them according to the value of the photon spectral index, $δ$. The redshift of the EHBL HESS J1943+213 is also tightly constrained using the same photohadronic model. Within the sample, a plurality of flaring epochs fall in the high-emission state which is followed by the low-emission state and the very-high-emission state respectively. These fractions of flaring epochs characterize only the present sample, not the EHBL population at large. Due to the anomalous behavior of the VHE gamma-ray spectra of the EHBL H 2356-309, we suggest it to be a new subclass of EHBL having hard and very soft intrinsic spectra during different flaring epochs.
发表机构
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México（墨西哥国立自治大学核科学研究所）
- Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València（瓦伦西亚理工大学纯数学与应用数学大学研究所）
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados del IPN, Unidad Mérida（墨西哥国家理工学院高级研究中心梅里达单位应用物理系）
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