Series: Astronomy Colloquium
Date: Wednesday 17-Sep-2025
Time: 16:05-17:00 (4:05-5:00 pm)
Location: ATL 2400
Speaker: Prof. Irina Zhuravleva (University of Chicago)
Title: Unveiling Hot Gas Kinematics in Galaxy Clusters with XRISM: Stormy Weather, Multiple Cascades, and Calm Outskirts
The recent launch of the XRISM observatory has opened a new era in high-energy astrophysics, providing high-resolution X-ray spectra of various X-ray sources, including the long-awaited spectra of extended X-ray sources like clusters of galaxies. Direct measurements of hot gas kinematics are now possible, providing crucial insights into energy circulation in supermassive black hole feedback and cluster mergers - key processes affecting the evolution of galaxies and large-scale structure. In this talk, I will present XRISM results from observations of well-known bright galaxy clusters. I will discuss gas kinematics near the central supermassive black hole in the Virgo cluster, multiple velocity cascades in the core of the Perseus cluster strongly affected by AGN feedback, the “stormy weather” of the Coma cluster and its unusual velocity power spectrum despite being considered a textbook example of ICM turbulence, gas kinematic studies in a relaxed cluster A2029 out to cosmologically interesting radii, along with other exciting findings.
In-person colloquia are usually preceded by espresso and ice cream at 1:45 pm outside room PSC 1150 and are followed by an informal reception at 5:15 pm in that room. Anyone interested in talking with the speaker, or being added to the colloquium announcement email list, should contact the colloquium organizer Dr. Richard Mushotzky. Lunch will normally be reserved for the speaker to talk to graduate students. Anyone asking a question during a talk is asked to raise their hand and be acknowledged before speaking. Contact Dr. Richard Mushotzky for details.
Colloquium Organizer:
Dr. Richard Mushotzky
Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.
