A spectral hardening in the Fermi-LAT Data of 1ES 0502+675
A spectral hardening in the Fermi-LAT Data of 1ES 0502+675
复制标题
1ES 0502 675 费米-LAT 数据中的谱硬化
DOI：
10.1093/mnras/stac061
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发表时间：
2022-01
影响因子：
4.8
通讯作者：
Jiancheng Wang
中科院分区：
文献类型：
--
作者：
Zeng Yuheng;Dahai Yan;Wen Hu;Jiancheng Wang
利用费米大型天文望远镜(Fermi-LAT)PASS 8数据(100 MeV~300GeV)，研究了2008年8月至2021年4月期间blazar 1ES 0502+675的伽马射线能谱特征。在中等耀斑状态(MJD 55050-55350)的伽马射线谱中，发现在1GeV处有显著的(SIM4\Sigma)硬化。断裂能以下和以上的光子指数分别为$Gamma_1=2.36\pm0.31$和$\Gamma_2=1.33\pm0.11$。在其余的观测中，γ射线能谱可用光子指数约为1.6$的幂函数形式来描述。在单区同步加速器自康普顿(SSC)模型的框架下，光谱硬化被解释为同步加速器分量和SSC分量之间的跃迁。这可能是电子的破缺/最大洛伦兹因子略有增加的结果。
The $\gamma$-ray spectral feature of the blazar 1ES 0502+675 is investigated by using Fermi Large Area Telescope (Fermi-LAT) Pass 8 data (between 100 MeV and 300 GeV) covering from 2008 August to 2021 April. A significant ($\sim4\sigma$) hardening at $\sim$ 1 GeV is found in the $\gamma$-ray spectrum during a moderately flaring state (MJD 55050-55350). The photon index below and above the break energy is $\Gamma_1=2.36\pm0.31$ and $\Gamma_2=1.33\pm0.11$, respectively. In the rest of the observations, the $\gamma$-ray spectrum can be described by a power-law form with the photon index of $\approx1.6$. In the frame of a one-zone synchrotron self-Compton (SSC) model, the spectral hardening is interpreted as the transition between the synchrotron component and the SSC component. This could be the result of a slight increase of the break/maximum Lorentz factor of the electrons.