Abstract
The giant radio galaxy M87 accompanies one of the nearest Active-Galactic-Nuclei jets showing the intense radiation through radio to TeV gamma-ray. Its proximity and the large mass of the central black hole provide an excellent advantage to probe the sites of jet formation and gamma-ray production. Here we review some of our recent studies for the inner jet of M87 based on the multi-frequency and multi-epoch VLBI observations, especially focusing on the two remarkable regions i.e., the jet base near the black hole and the peculiar feature HST-1. Our multi-frequency observations with the phase-referencing technique revealed the detailed structure of the jet base region regarding the location of the central engine and the collimation profile. In terms of HST-1, the intense multi-epoch VLBI monitoring constrained the accurate kinematic properties and the structural variations in this complicated feature, together with a possible connection to the gamma-ray activities. At the end of this contribution, we briefly describe our new monitoring project for M87 with VERA, which permits a detailed study on the structural evolution in the jet base region.
Highlights
Powered by the accretion of material onto supermassive black holes, relativistic jets in Active Galactic Nuclei (AGN) are the most energetic phenomena in the Universe
We review some of our recent studies for the inner jet of M87 based on the multi-frequency and multi-epoch VLBI observations, especially focusing on the two remarkable regions i.e., the jet base near the black hole and the peculiar feature Hubble Space Telescope (HST)-1
In this contribution we have reviewed some of our recent studies for M87 based on the multi-frequency and multiepoch VLBI observations
Summary
Powered by the accretion of material onto supermassive black holes, relativistic jets in Active Galactic Nuclei (AGN) are the most energetic phenomena in the Universe Understanding of their formation, collimation, acceleration as well as the production processes of high-energy emission up to MeV, GeV and TeV is one of the major goals in current astrophysics. The recent VLBI experiment at 230 GHz revealed a compact structure that is comparable to the size of the event horizon or the inner part of accretion disk [32] These provide evidence that the jet launch and collimation regions are beginning to be resolved in this jet.
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