Title: Cold interstellar medium and quasar-galaxy co-evolution toward the earliest universe

Speaker: Ran Wang 王然

Institute: Kavli Institute for Astronomy and Astrophysics

Host: Siyi Feng

Time: 14:30-16:30, Thursday, October, 27

Location: Physics Building 552 (online)

Abstract:

Active star formation and huge amount of molecular gas were detected in the host galaxies of quasars from local to high-z universe, implying co-evolution between the supermassive black holes (SMBHs) and their host galaxies.  

The cold interstellar medium (ISM) in the quasar host galaxies fuels both rapid SMBH accretion   and massive star formation. It provides an ideal tracer to probe the early growth  of the quasar-galaxy systems. The powerful interferometer telescope arrays at submillimeter/millimeter  wavelengths (e.g., ALMA, NOEMA) open unique opportunities to detect and image the  cold ISM from the earliest quasar host galaxies on sub-kpc scale. In this talk,  

I would like to review our recent studies of the physical and dynamical properties  of the cold ISM from the young quasar host galaxies discovered at the highest redshift  and discuss our understanding of SMBH-galaxy co-evolution in the early universe.

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related publications :

1). Probing the Full CO Spectral Line Energy Distribution (SLED) in the Nuclear Region of a Quasar-starburst System at z = 6.003, Li, J. et al. 2020, ApJ, 889, 162

2).Ionized and Atomic Interstellar Medium in the z = 6.003 Quasar SDSS J2310+1855 2020, ApJ, 900, 131

3). Spatially Resolved Molecular Interstellar Medium in a z = 6.6 Quasar Host Galaxy,2022, ApJ, 930, 27

Bio:

Research Interest:

I am working on millimeter and radio studies of the co-evolution between supermassive black holes and their host galaxies in the early universe. I have developed a series of observational programs to search and map the dust and gas components in the host galaxies of quasars discovered at z∼6, using the large millimeter and centimeter telescopes, such as ALMA, VLA, JCMT, and NOEMA. I am also interested in observational studies of dusty starburst galaxies in massive large-scale structures associated with quasars and Lyman alpha nebula.

Education:

2000–2004 Bachelor of Astrophysics, Peking University

2004–2009 Ph.D., Astrophysics,  Peking University

2006–2008 NRAO Pre-Doctoral program, National Radio Astronomy Observatory

Positions:

2009.09- 2010.03 Short-term Research Visitor, Purple Mountain Observatory

2010.05- 2013.04 External Jansky Postdoctoral Fellowship of NRAO

2013.05- 2013.10 Postdoctoral Research, Steward Observatory, University of Arizona

2013.10- 2022.04 Research Professor, Kavli Institute of Astronomy and Astrophysics (KIAA)

2022.04- present  Associate Professor, Department of Astronomy, Peking University