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DGCE SIG Seminar

Diffuse Gas in Cosmic Ecosystems Science Interest Group

DATE

Aug 24, 2023

TIME

4:00 pm EST

COMMUNITY

DGCE SIG

TYPE

Seminar

Directly Tracing the Halo-Scale Gas Flows in Emission at Intermediate Redshift

Sean Johnson (U Michigan Ann Arbor)

The circum-galactic medium (CGM) is at the nexus of the gas inflows and outflows that regulate galaxy evolution. Consequently, the CGM provides an ideal laboratory for studying galaxy fueling, feedback, and interactions. Historically, studies of the CGM primarily relied on background absorption spectroscopy which enables uniquely sensitive probes of intervening gas but typically lacks the spatial information needed to differentiate the origins of CGM gas flows unambiguously. Recently, the advent of wide-field optical integral field spectrographs enabled the discovery of giant (>50 kpc) scale CGM nebulae around quasars in non-resonant, rest-optical emission lines, providing unique 3D (2 spatial + velocity) maps of the CGM. I will present results from ongoing emission surveys of giant nebulae around ~30 z < 2 quasars that directly trace accretion, debris from interactions, and AGN outflows. Finally, I will discuss possibilities for future discoveries based on emission studies of the CGM enabled by a next-generation UVOIR telescope capable of spatially resolved spectroscopy.

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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.