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7月8日 Detection of the Circumgalactic Medium of Nearby Galaxies via Emission Lines
2019年07月02日

  报告题目:Detection of the Circumgalactic Medium of Nearby Galaxies via Emission Lines 

  报告人:Huanian ZhangSteward Observatory, University of Arizona 

  摘要:Galaxies are surrounded by diffuse and extended gas, which is often called the circumgalactic medium (CGM) and is the least understood part of galactic ecosystems. The CGM harbors more than 60% of the total baryons in a galaxy, is both the reservoir of gas for subsequent star formation and the depository of chemically processed gas, energy, and angular momentum from feedback. Observations and simulations of the CGM suggest that it is a multi-phase medium characterized by rich dynamics and complex ionization states. The study of the CGM has so far generally come from absorption line studies of the spectra of distant objects, typically QSOs, whose lines of sight intersect lower redshift galaxy halos. However, such study is limited by statistics. Instead, I will describe a novel approach to study the CGM via emission lines, which allows for direct mapping of individual galaxies and a variety of results obtained.  

  时间地点:78日周一上午10:00,紫台3-302会议室  

欢迎大家参加!

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