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UV STIG Seminar

UV Science and Technology Interest Group : Quorum for Ultraviolet Exploration of Science and Technology (QUEST) Seminar 10

DATE

Dec 01, 2022

TIME

2:00 pm EST

COMMUNITY

UV STIG

TYPE

Seminar

QUEST Seminar 10

The Turbulent Life of the Circumgalactic Medium – Insights learned from the Cosmic Ultraviolet Baryon Survey (CUBS)

Hsiao-Wen Chen, University of Chicago

The circumgalactic medium (CGM) contains the fuel for future star formation and the record of past feedback, making it uniquely sensitive to the physics of baryonic flows. Characterizing the diffuse multiphase CGM across cosmic time holds a key to unveiling the drivers of galaxy growth, the priority area of the “Cosmic Ecosystems” theme highlighted by the 2020 Decadal Survey. The Cosmic Ultraviolet Baryon Survey (CUBS) is designed to map the intergalactic and circumgalactic gas at intermediate redshifts, bridging the gap between previous efforts at z < 0.4 and at z ~ 2. The program utilizes high-quality quasar absorption spectra and matching deep galaxy survey data. It exploits the synergy between space-based UV spectroscopy and ground-based wide-field surveys to advance our understanding of the cosmic evolution of baryonic structures. In this talk, I will highlight a few examples to illustrate how combined space-based UV and ground-based optical echelle absorption spectroscopy of distant QSOs provides a powerful tool for resolving distinct ionization and thermodynamic states, as well as chemical enrichment histories, within the blended multiphase medium over a broad range of gas densities. The accompanying deep and wide galaxy survey data further provide a sensitive record of the environment on both large and small scales, revealing a diverse range of galaxy properties. I will present empirical evidence showing that diffuse CGM is turbulent. For the first time, a clear distinction is found in the significance of turbulent energy between passive and star-forming haloes. I will also review other key findings from the CUBS program and briefly discuss the future outlook for CGM studies

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An illustration of Sun-like star HD 181327 and its surrounding debris disk. The star is at top right. It is surrounded by a far larger debris disk that forms an incomplete ellpitical path and is cut off at right. There’s a huge cavity between the star and the disk. The debris disk is shown in shades of light gray. Toward the top and left, there are finer, more discrete points in a range of sizes. The disk appears hazier and smokier at the bottom. The star is bright white at center, with a hazy blue region around it. The background of space is black. The label Artist's Concept appears at lower left.