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- W2341680201 abstract "Observational constraints of relativistic jets from black holes has largely come from the most powerful and extended jetscite{Jorstad05,Asada14}, leaving the nature of the low luminosity jets a mysterycite{Falcke04}. M81* is one of the nearest low-luminosity jets, which underwent an extremely large radio flare in 2011, allowing us to study compact core emission with unprecedented sensitivity and linear resolution. Utilizing a multi-wavelength campaign, we were able to track the flare as it re-brightened and became optically thick. Simultaneous X-ray observations indicated the radio re-brightening was preceded by a low energy X-ray flare at least $t_{rm delay}>12 {rm days}$ prior. Associating the time delay between the two bands as the cooling time in a synchrotron flarecite{Urry97,Bai03}, we find the magnetic field strength was $1.9<B<9.2 {rm G}$, which is consistent with magnetic field estimate from spectral-energy distribution modelingcite{Kellerman81}, $B<10.2 {rm G}$. In addition, VLBA observations at 23 GHz clearly illustrate a discrete knot moving mildly relativistically at $v_{rm app}/c=0.51pm0.17$ associated with the initial radio flare. The observations indicate radial jet motions for the first time in M81*. This has profound implications for jet production, as it means radial motion can be observed in even the lowest-luminosity AGN, but at slower velocities and smaller radial extents ($approx10^4 R_{rm G}$)." @default.
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- W2341680201 date "2016-04-18" @default.
- W2341680201 modified "2023-09-23" @default.
- W2341680201 title "Discrete knot ejection from the jet in a nearby low-luminosity active galactic nucleus, M81∗" @default.
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- W2341680201 doi "https://doi.org/10.1038/nphys3724" @default.
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