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Quenched Massive Spiral Galaxies
报告题目:Quenched Massive Spiral Galaxies
报 告  人:Prof. Xi Kang (Zhejiang University/Purple Mountain Observatory)
报告时间:2021-04-01 16:00:00

 Abstract: Quenched massive spiral galaxies have attracted great attention recently, as more data is available to constrain their environment and cold gas content. However, the quenching mechanism is still uncertain. In this talk, we report the identification of a rare population of very massive, quenched spiral galaxies with stellar mass

1011 M and halo mass 1013 M from the Sloan Digital Sky Survey at redshift z0.1. The CO observations using the IRAM-30m telescope show that these galaxies contain only a small amount of molecular gas. Similar galaxies are also seen in the state-of-the-art semi-analytical models and hydro-dynamical simulations. It is found from these theoretical models that these quenched spiral galaxies harbor massive black holes, suggesting that feedback from the central black holes has quenched these spiral galaxies. This quenching mechanism seems to challenge the popular scenario of the co-evolution between massive black holes and massive bulges.


Bio: Xi Kang, the professor at the physics department of Zhejiang University and the director of the joint astronomy center between ZJU and Purple Mountain Observatory, CAS. He got his PhD in 2005 from the Shanghai Astronomical Observatory, and worked as a postdoc between 2005-2009 at the university of Oxford, Max-Planck-Institute for Astronomy. In 2009, He joined PMO and led the galaxy and cosmology group. He is now involving the buildup of astrophysics in ZJU. His main research interest focus on galaxy formation and the large-scale structure.