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Black Hole Astrophysics with VLBI: Past, Present, and Future
- Workshop in honor of Professor INOUE Makoto's retirement -
March 27-29, 2017
Mitaka Campus, NAOJ, Tokyo, Japan
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Invited Presentation

Probing black hole physics with high resolution radio observations

Author(s): Andrei Lobanov (MPIfR, Bonn, Germany)

Presenter: Andrei Lobanov (Max-Planck-Insitut für Radioastronomie, Bonn, Germany)

Imaging and polarimetry of radio emission on finest angular scales provided by radio interferometry offers a range of possibilities for studying extreme vicinity of supermassive black holes (SMBH). Very long baseline interferometry (VLBI) experiments at millimetre wavelengths and with ground-space interferometers provide imaging at a resolution approaching the scales comparable with the event horizon scales in Sgr A* and SMBH in nearby active galaxies. VLBI and multi-band studies of relativistic flows provide an excellent tool for probing the physical conditions in the extreme vicinity of SMBH and in the nuclear regions of active galaxies. All these scientific avenues have been pursued actively in Japan -- including among others the successes of VERA and VSOP, and the advents of ALMA and the EHT, with Inoue-san making long standing contributions to all of these efforts. This presentation comprises a brief review of cornerstone results and upcoming prospects in the field of VLBI studies of supermassive black holes and their vicinity, with particular focus put on detecting general relativity effects in the immediate vicinity of SMBH and answering the fundamental question of the physical nature of the central massive objects in galaxies.