Nakamura, Masanori

The M87 Jet.

Author list: Masanori Nakamura

M87, the "Rosetta Stone" of relativistic jets, is extensively examined based on our ground/space VLBI observations and MHD jet theories. We summarize properties of the jet and core emissions on 10 - 10⁵ r_s scales; observed parabolic streamlines may be as a consequence of the magnetically driven jet, that is thermally confined by the stratified ISM in the SMBH gravitational potential. We also suggest a frequency depending VLBI core shift in M87 can be explained in the framework of an MHD parabolic jet. ASIAA and SAO are leading the Greenland Telescope (GLT) project to conduct sub-mm VLBI observations towards M87. We briefly introduce the GLT science cases for M87, that include not only imaging the BH shadow, but exploring the origin of the jet and nature of inner accretion flows onto the SMBH inside 10 r_s; our science goals shall play a fundamental role in understanding of the AGN central engine.