Superluminal Radio Features in the M87 Jet and the Site of Flaring TeV Gamma-ray Emission - AstrophysicsReport as inadecuate




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Abstract: Superluminal motion is a common feature of radio jets in powerful gamma-rayemitting active galactic nuclei. Conventionally, the variable emission isassumed to originate near the central supermassive black-hole where the jet islaunched on parsec scales or smaller. Here, we report the discovery ofsuperluminal radio features within a distinct flaring X-ray emitting region inthe jet of the nearby radio galaxy M87 with the Very Long Baseline Array. Thisshows that these two phenomenological hallmarks - superluminal motion andhigh-energy variability - are associated, and we place this activity muchfurther (>=120 pc) from the ``central engine- in M87 than previously thoughtin relativistic jet sources. We argue that the recent excess very high-energyTeV emission from M87 reported by the H.E.S.S. experiment originates from thisvariable superluminal structure, thus providing crucial insight into theproduction region of gamma-ray emission in more distant blazars.



Author: C.C. Cheung (NRAO and Stanford), D.E. Harris (Harvard-CfA), L. Stawarz (Stanford-KIPAC)

Source: https://arxiv.org/



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