ABSTRACT

It is the GRAVITY on the Very Large Telescope Interferometer that successfully resolve the broad-line regions of 3C 273 and open a new era of active galactic. Reverberation mapping as a powerful tool to investigate inner structure of AGNs will finally complementarily combine with GRAVITY for simultaneous determinations of black hole mass and cosmological distances. This provides a new way of measuring cosmological expansion history of Universe Expansion, which is fully independent of extinction correction and calibrations of cosmic ladders.

BIO
Graduated from National University of Defense Technology, and obtained PhD from USTC in 1995. Astrophysics professor in IHEP works on supermassive black holes, quasars and cosmology.