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Three-dimensional spectroscopy—two spatial dimensions plus one spectral dimension—has transformed our ability to explore the Universe at optical wavelengths. Taking advantage of this technique, we have carried out two large observing programs: the Dwarf Galaxy Integral-field Survey (DGIS) and the Westlake Integral-field Survey for H0 (WISH). In this talk, I will first discuss the discovery of an off-nuclear intermediate-massive black hole with a mass of only 35,000 solar masses in DGIS, and its unusual environment provides a first glimpse into how wandering black holes are fed through the gravitational wake. I will then move to the Hubble tension and introduce WISH, which uses galaxy–massE as a new cosmic ruler to measure the Hubble constant independently of SN Ia. I will present the calibration of galaxy–massE and its pilot measurement of the Hubble constant, which already ranks among the best direct measurements.

BIO

Yong Shi is a professor in the Department of Astronomy at Westlake University. His main research interests are galaxy formation and evolution, massive black holes, and cosmology. He received his bachelor's degree from the Department of Astronomy at Peking University in 2003 and his Ph.D. in astronomy from the Department of Astronomy at the University of Arizona in 2008. From 2008 to 2009, he conducted postdoctoral research at the University of Arizona, and from 2009 to 2013, he conducted postdoctoral research at the California Institute of Technology. From 2013 to 2025, he was a professor at Nanjing University, and in 2025 he joined Westlake University. He has been awarded support from the National Young Thousand Talents Program, the National Science Fund for Distinguished Young Scholars, and the Tencent "Xplorer Prize."

Host: Song Huang