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VLBA total intensity map of the M87 jet at 43 GHz (2-a)

Image Credit: M. Nakamura & K. Asada, 2013, ApJ, 775, 118

VLBA total intensity map of the M87 jet at 43 GHz (2-a), showing the synchrotron radiation of relativistic electrons. A hollow, edge-brightened emission of the jet up to ~ 500 r_s is clearly seen. A small circle indicates the size of the black hole shadow, which the GLT project is seeking to resolve with future sub-mm VLBI observations.