Oral Presentation

Properties of the CGM of DESI luminous red galaxies

Author(s): Yu-Ling Chang (NTU) and Ting-Wen Lan (NTU)

Presenter: Yu-Ling Chang (National Taiwan University)

The circumgalactic medium (CGM), the interface of gas flows between galaxies and intergalactic medium, holds crucial information about the key mechanisms driving galaxy evolution. To investigate the connections between the properties of the CGM and galaxies, we assemble a sample of about 1 million luminous red galaxies (LRGs) with background QSOs compiled from the largest spectroscopic dataset provided by the Dark Energy Spectroscopic Instrument (DESI) survey. With this massive dataset, we statistically characterize the properties of the CGM of DESI LRGs, including absorption line strengths, gas spatial distribution, and gas kinematics, and combine recent radio datasets to identify galaxies with radio-mode feedback in operation. In this talk, I will present the latest results of the CGM properties of LRGs and address two key questions: (1) how massive galaxies and their CGM co-evolve through cosmic time and (2) how radio-mode feedback affects the CGM of massive galaxies. These measurements place stringent constraints on the models of gas flows and provide novel insight into the mechanisms governing the cosmic baryon cycle.