Titile: From a wandering massive black hole to the Hubble constant with 3-D spectroscopy

Speaker: 施勇

Institute: 西湖大学

Host：王俊峰

Time：2026年9月10日周四 14:30

Location：物理楼552

Abstract：

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 most precise direct measurements.

Bio：

施勇，西湖大学天文系教授。主要研究兴趣为星系形成和演化，大质量黑洞和宇宙学。2003年本科毕业于北京大学天文系，2008年于美国亚利桑那大学天文系获得天文博士学位，2008年至2009年在亚利桑那大学从事博士后研究， 2009年至2013年在美国加州理工学院从事博士后研究，2013年至2025年南京大学教授，2025年加入西湖大学。2013年获国家青年千人，2018年获国家杰出青年科学基金，2019年获首届腾讯“科学探索奖”。

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