Lunch talk on Apr. 15th, 2019

Using quasar absorption lines to probe gas in and around high-z galaxies

Speaker: Siwei Zou (Peking University)

Venue: The 3rd floor, SWIFAR Building

Time: 12:30 PM, Monday, 15th April, 2019

Abstract: 

A quasar is an extremely bright point source in the high-z universe, providing a unique technique to probe the medium along the line-of-sight. When the emission light of a quasar goes through a galaxy, the absorption gives us information about inter-galactic-medium (IGM), circumgalactic medium(CGM), inter-stellar-medium (ISM) in and around the galaxy. Thus the absorption lines are widely used as a strong tool to study the physical conditions of the gas(kinematic states, ionization state, temperature and chemical abundances, etc.) in the intervening systems.  I will introduce how we select the sample, how to obtain the physical properties of the ISM and CGM from quasar spectrum and how we connect the results to the star formation and galaxy evolution.