标题： 喷流活动星系核 费米- LAT 观测到的 3C 279 和 PMN J0948+0022 的情况 显示英文标题

标题： Flaring Active Galactic Nuclei. The cases of 3C 279 and PMN J0948+0022 as seen by the Fermi-LAT

摘要： 活动星系核（AGNs）在整个电磁谱上表现出变化，在不同频率上有不同的爆发事件。费米卫星上的大面积望远镜具有高灵敏度和几乎均匀的天空覆盖范围，使其成为在长时间尺度上监测大量AGNs的强大工具。这使我们能够在伽马射线中检测到几个爆发的AGNs，并触发了从射电到TeV能量范围内的专门多波段活动。我们讨论了两种不同类型的爆发AGN的结果：平坦谱射电类星体3C 279，特别是该源的伽马射线爆发与光学偏振角的剧烈变化的巧合，以及第一个来自射电强窄线 Seyfert 1 的伽马射线爆发，PMN J0948+0022。 显示英文摘要

摘要： Active galactic nuclei (AGNs) exhibit variability across the entire electromagnetic spectrum with distinct flaring episodes at different frequencies. The high sensitivity and nearly uniform sky coverage of the Large Area Telescope on board the Fermi satellite make it a powerful tool for monitoring a large number of AGNs over long timescales. This allowed us to detect several flaring AGNs in gamma rays, triggering dedicated multifrequency campaigns on these sources from radio to TeV energies. We discuss the results for two different types of flaring AGN: the flat spectrum radio quasar 3C 279, in particular the coincidence of a gamma-ray flare from this source with the drastic change of the optical polarization angle, and the first gamma-ray flare from a radio-loud narrow-line Seyfert 1, PMN J0948+0022.