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DGCE SIG Seminar

Diffuse Gas in Cosmic Ecosystems Science Interest Group

DATE

May 22, 2025

TIME

4:00 pm EST

COMMUNITY

DGCE SIG

TYPE

Seminar

The CGM in 1-D, 2-D, and 3-D (Round, AxiSymmetric, and To Be Determined)

Ben Oppenheimer, University of Colorado

Today, I will introduce a set of 1-dimensional (“round”) models for gaseous atmospheres. This “Descriptive Parametric Model” is meant to be a community tool for you to model volume-filling gaseous halos spanning the CGM to the Intracluster Medium. What we will have fun doing is seeing how the same model compares to recent observations from the Ultraviolet, X-ray, submillimeter via the Sunyaev-Zel’dovich Effects, and radio via Fast Radio Burst dispersion measurements.

I then will move onto new COS observations targeting the axisymmetric structure of disc galaxies, following the final stages of accretion along the semi-major axis of inclined galaxies. This Cycle 31 program targets sight lines where we are guaranteed to observe many transitions, including OVI, OI, HI, CII, CIII, MgI, in addition to existing MgII.

Finally, I will discuss the future prospects of detecting complex 3-dimensional structures in outflows with HST in the UV and JWST in the near and mid-IR. JWST is in fact an ideal platform to observe molecular outflows around galaxies in the local universe. HST still has a lot of opportunities to constrain theoretical models of outflows.

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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.