Science Interest Group
Diffuse Gas in Cosmic Ecosystems
The Diffuse Gas in Cosmic Ecosystems Science Interest Group (DGCE SIG) offers an opportunity for researchers across all career stages studying diffuse gas.
About DGCE SIG
Exploring Diffuse Gas Throughout the Universe
The Diffuse Gas in Cosmic Ecosystems Science Interest Group (DGCE SIG) provides a forum for researchers and students who are interested in diffuse gas throughout the universe, in the interstellar, circum-galactic, circum-quasar, and intergalactic media, to come together to discuss the latest discoveries and ideas.
This SIG will host monthly topical talks by experts on diffuse gas and its properties, along with regular discussion on what observations and instruments are needed to move the field forward. The talk schedule is monthly, on the 4th Thursday of the month at 4pm Eastern/1pm Pacific time.
DGCE SIG motivation: Most of the ordinary matter in the universe is found in the tenuous gas between stars and galaxies. This matter is mostly diffuse and found in a mixture of phases, spanning a huge range of size scales, connecting galaxies to each other in a massive cosmic web, while also playing a key role in star and planet formation. The physical processes that govern the behavior of this material are the same, regardless of the scale. This Science Interest Group (SIG) organizes community input on Diffuse Gas found across Cosmic Ecosystems, emphasizing the interconnectedness of the systems at all scales. The SIG focus includes the circumgalactic and intergalactic media, and the interstellar medium environment of gas/diffuse plasma between stars and galaxies, as well as the flows within and around each of these media as they connect to each other. This SIG enhances the voice of this critical field within the broader astronomical community.
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News & Events
Illuminating the Galactic Baryon Cycle at Cosmic Noon. Speaker: Tucker Jones
Mapping Hot Gas Kinematics in Galaxy Clusters with XRISM: What Have We Learned So Far? Speaker Irina Zhuravleva, University of Chicago Abstract The XRISM observatory (JAXA/NASA), launched in September 2023, is now providing the long-awaited high-resolution X-ray spectra of extended…
The 247th AAS meeting (joint with the Historical Astronomy Division) will be held 4-8 January in Phoenix, Arizona at the Phoenix Convention Center. Join us in the exhibit hall at the NASA booth and attend the NASA sessions.
Observing Shock Dynamics in a Supernova Remnant Near the ISM Interface with an Integral Field Spectrograph Speaker Emily Witt, Johns Hopkins University Abstract Supernovae (SN) play a key role in processing matter and energy in the galaxy. This processing begins…
Feedback and Expansion of Galactic Atmospheres Speaker Mark Voit, Michigan State University Abstract Galaxy evolution is governed by feedback mechanisms that seem to be self-regulating. In galaxy clusters, feedback heating appears to balance radiative cooling, but in smaller halos, the…
Using Faint Emission Lines to Study Galaxies at Cosmic Noon Speaker Allison Strom, Northwestern University Abstract A significant fraction of all stars in the Universe today formed during a 2-3 Gyr period around z~1-3, when both cosmic star-formation rate density…
2026 DGCE SIG Seminars
| Date | Speaker |
|---|---|
| March 26, 2026 | Sarah Tuttle |
| April 23, 2026 | Kevin France |
| May 28, 2026 | Freeke van de Voort |
| June 25, 2026 | TBA |
| July 23, 2026 | Drummond Fielding |
| August 27, 2026 | Todd Thompson |
| September 24, 2026 | TBA |
| October 22, 2026 | Carlos Vargas |
Leadership Council
| Name | Affiliation & Email |
|---|---|
| Danielle Berg | UT Austin |
| Sanchayeeta Borthakur | ASU |
| Hsiao-Wen Chen | U Chicago |
| Erika Hamden | U Arizona |
| Gwen Rudie | Carnegie |
| Claudia Scarlata | U Minnesota |
| Carlos Vargas | U Arizona |
| Jessica Werk | U Washington |
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