AI 中文总结
该研究利用VERITAS等多台设备对BL Lacertae的长时间甚高能耀斑进行多波长观测，VERITAS观测约9.8小时给出约28σ探测，发现其耀斑活动超一个月，通过宽带光谱建模表明含外部逆康普顿成分的同步自康普顿模型更优。
AI 中文摘要
我们报告了利用甚高能辐射成像望远镜阵列系统（VERITAS）对BL Lacertae（VER J2202+422）的长时间甚高能（VHE；$E>100$ GeV）耀斑的首次观测。2022年10月15日，费米大面积望远镜（LAT）探测到源自该耀变体的GeV活动增强。这引发了多波长观测活动，包括VERITAS、Swift、NuSTAR以及一些光学和射电天文台的观测。VERITAS在2022年9月1日至12月1日期间共观测该源约9.8小时，对这些数据的分析给出了约28σ的源探测。此前观测到的BL Lacertae的VHE耀斑持续时间为几分钟到几天，而在费米-LAT探测到最初的耀斑活动后，VERITAS继续探测到该源的耀斑活动超过一个月（约40天）。宽带光谱建模表明，具有外部逆康普顿（EC）成分的同步自康普顿（SSC）模型比单区SSC模型更合适。
英文摘要
We report the first observations of a long-duration very-high-energy (VHE; $E > 100$ GeV) flare from BL Lacertae (VER J2202+422), taken with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). On October 15, 2022, the Fermi-Large Area Telescope (LAT) detected elevated GeV activity originating from this blazar. This triggered a multiwavelength campaign, which includes observations from VERITAS, Swift, NuSTAR, and select optical and radio observatories. VERITAS observed the source for a total of $\sim 9.8$ hours between September 1, 2022 and December 1, 2022. An analysis of these data yields a $\sim 28 σ$ detection of the source. While previously observed VHE flares from BL Lacertae have lasted on time-scales of minutes to days, VERITAS continued to detect flaring activity from the source for over a month ($\sim 40$ days) after the original flaring activity was detected with Fermi-LAT. Broadband spectral modeling shows that a synchrotron self-Compton (SSC) model with an external inverse-Compton (EC) component is preferred over a one-zone SSC model.
Comments19 pages, 8 figures. Accepted for publication in the Astrophysical Journal (ApJ)
