发表机构
Istituto Nazionale di Fisica Nucleare, INFN, Roma Tor Vergata; Space Science Data Center, SSDC, Agenzia Spaziale Italiana, ASI; Department of Fundamental Physics, University of Salamanca（意大利国家核物理研究所，罗马托尔维加塔分部; 意大利航天局空间科学数据中心; 萨拉曼卡大学基础物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究报道了费米-LAT在2023年探测到CSS射电星系3C 216的意外伽马射线爆发，其辐射由喷流中的同步加速和同步自康普顿过程主导，证实其具有类耀变体核心，是17年监测中首次观测到的大能量事件。
AI 中文摘要
致密陡谱（CSS）射电星系是真正的年轻/间歇喷流或被困于富气体环境中的受阻喷流射电星系，在GeV伽马射线能段很少被探测到，而3C 216是一个有趣的例外。2023年，费米伽马射线太空望远镜上的大面积望远镜（LAT）探测到来自该CSS射电星系的意外、快速且强烈的GeV伽马射线爆发，随后尼尔·格雷尔斯雨燕太空天文台进行了紫外和X射线观测。在爆发期间，其光谱能量分布由相对论性喷流中产生的同步加速辐射和同步自康普顿辐射主导，表明其属于年轻类星体。射电波段的特征，如超光速运动和平谱核成分，证实3C 216拥有一个独特的类耀变体核心，该核心弯曲且以与视线成小角度被观测。这是17年费米-LAT连续全天和时域监测中观测到的来自该源的独特大能量事件。
英文摘要
While compact steep-spectrum (CSS) radio galaxies, genuine young/intermittent-jet or frustrated-jet radio galaxies trapped in gas-rich environments, are rarely detected in GeV gamma-ray energy bands, 3C 216 is an interesting exception. In 2023, the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope detected an unexpected, rapid, and powerful GeV gamma-ray outburst from this CSS radio galaxy, which was followed up by UV and X-ray observations from the Neil Gehrels Swift Space Observatory. During the outburst its spectral energy distribution is dominated by synchrotron and synchrotron self-Compton radiation, produced in the relativistic jet, suggesting a young quasar classification. Radio-band features, such as superluminal motion and a flat-spectrum core component, confirm that 3C 216 harbors a distinct blazar-like core, bent and viewed under a small angle to the line of sight. This is the unique large and energetic event from the source observed in 17 years of Fermi-LAT continuous all-sky and time-domain monitoring.
Comments5 pages, 2 figures, submitted to IAU Conf. Proc., IAU Symposium 406, Future landscape of astrophysical transients: novel approaches in theory and observations
