Gas around galaxies, the circumgalactic medium (CGM), plays an essential role in our understanding of galaxy evolution. Being the interface between galaxies and the intergalactic medium, it is the region where gas accretion and outflows --key drivers of galaxy evolution-- leave their signatures. In this talk, I will show that one can probe the physical properties of the CGM and extract the signatures of gas flows via absorption line spectroscopy. I will show that by applying novel statistical techniques to massive spectroscopic datasets from the SDSS, we can obtain unprecedented absorption line measurements, reveal new pictures of the CGM, and address two fundamental questions about the CGM-- (1) how the properties of galaxies and their surrounding gas correlate with each other and (2) how the properties of the CGM evolve through cosmic time. Finally, I will discuss how the properties of the CGM can place strong constraints on the models of galaxy evolution.
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 Ting-Wen Lan 藍鼎⽂.pdf | 19.77 MB |