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DGCE SIG Seminar

Diffuse Gas in Cosmic Ecosystems Science Interest Group

DATE

Apr 27, 2023

TIME

4:00 pm EST

COMMUNITY

DGCE SIG

TYPE

Seminar

Far-Ultraviolet Spectra: The Key to Bridging Galaxy Evolution Across Cosmic Time

Gwen Rudie (Carnegie Observatories)

The exchange of baryons between galaxies and their surrounding intergalactic medium (IGM) is a crucial but poorly constrained aspect of galaxy formation and evolution. I will present results from the Keck Baryonic Structure Survey (KBSS) and the Cosmic Ultraviolet Baryon Survey (CUBS), two spectroscopic surveys de-signed to explore the evolution of galaxies and their surrounding intergalactic and circumgalactic baryons during the height of cosmic star formation and its decline to present day. Analysis of KBSS and CUBS QSO sightline data constrain the thermodynamics, kinematics, and chemistry of the CGM over the majority of the Universe’s history and four decades of galaxy luminosity, providing direct constraints on gas flows in and out of galaxies. I will highlight results on the size, kinematics, and thermal properties of circumgalactic gas at z~2 and the multi-elemental chemical abundances of the intermediate redshift CGM. Collectively, these data demonstrate the CGM provides one of the best testing grounds for models of galaxy-scale outflows. I’ll conclude by discussing multi-wavelength observations spanning the far UV to the infrared utilizing near-future instruments including Magellan/MIRMOS and future ground and space based observatories which will open new discovery space in our understanding of cosmic ecosystems.

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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.