Science News内容：

　　题目：Precessing jet nozzle connecting to a spinning black hole in M87

　　摘要：The nearby radio galaxy M87 offers a unique opportunity to explore the connections between the central supermassive black hole and relativistic jets. Previous studies of the inner region of M87 revealed a wide opening angle for the jet originating near the black hole.The Event Horizon Telescope resolved the central radio source and found an asymmetric ring structure consistent with expectations from general relativity. With a baseline of 17 years of observations, there was a shift in the jet’s transverse position, possibly arising from an 8- to 10-year quasi-periodicity. However, the origin of this sideways shift remains unclear. Here we report an analysis of radio observations over 22 years that suggests a period of about 11 years for the variation in the position angle of the jet. We infer that we are seeing a spinning black hole that induces the Lense–Thirring precession of a misaligned accretion disk. Similar jet precession may commonly occur in other active galactic nuclei but has been challenging to detect owing to the small magnitude and long period of the variation.

　　报告人：董江（紫台研究生）

Journal club内容：

　　题目：Tidal disruption events as probes of BH accretion

　　报告人：韩园珍（紫台研究生）

　　时间：2023年11月14日星期二12:15

　　地点：紫台3-302

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