Mapping the Cosmic Web with IGM Tomography

May 30, 2024 - 11:00 am to 12:00 pm

SLAC, Kavli 3rd Floor Conf. Room

Drew Newman (Carnegie) In Person and zoom

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Maps of the cosmic web are usually built from the distribution of galaxies, but recently a complementary perspective has been gained by mapping the three-dimensional structure of the intergalactic medium. The Lyman-alpha Tomography IMACS Survey (LATIS) has now produced the largest Mpc-resolution maps of the IGM at redshift z~2.5. These maps provide a new way to detect and map large-scale structures in the cosmic noon era, including the ancestors of today's galaxy clusters. One unique strength of the method is that it is able to locate overdense regions independently of their galaxy content, thereby circumventing selection biases affecting spectroscopic surveys of high-redshift galaxies. I will discuss some surprising recent discoveries enabled by IGM tomography spanning protoclusters, AGN feedback, and the early stages of environment-dependent galaxy evolution.