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NewAthena X-ray Advances: NASST and ACO Science Webinars

Beginning in 2022, the ASST and ACO launched the “Athena X-ray Advances: ASST & ACO Science Webinars”, which were reformulated in November 2023 as “NewAthena X-ray Advances: NASST & ACO Science Webinars.” These science seminars focus on the scientific case for NewAthena and aim to keep the NewAthena community informed about exciting developments relevant to Athena’s capabilities. The series is primarily intended for members of the NewAthena community but is open to the wider astronomy community.

Each webinar in the series is broadcast via Zoom Webinars. To facilitate live participation from a broad international audience, seminars are typically held from 15:00 to 16:00 CEST/CET. Recordings of the webinars are archived on the ACO YouTube channel.

Coming webinar

On 17 June at 12 CEST, Yuki Omiya (Nagoya University) will present "Elucidation of intra-cluster medium dynamics of merging clusters with XRISM/Resolve." 

Abstract: Mergers of galaxy clusters inject vast gravitational energy into the intra-cluster medium (ICM), driving bulk flows and shear layers that are expected to cascade into turbulence and ultimately heat, while also shaping gradually growing ICM magnetic fields and non-thermal particle populations. Establishing this energy-conversion pathway observationally has long been challenging, largely because the ICM velocity field is difficult to measure directly. In this talk, I will review recent XRISM/Resolve results of merging galaxy clusters, that provide direct constraints on the line-of-sight velocity field. I will focus on representative systems—e.g., Abell 3667 (Omiya et al. 2026), Abell 2319 (XRISM collaboration 2025), and Abell 754 (Omiya et al. in press)—covering distinct merger geometries and dynamical stages. Using spatially resolved velocity field measurements, I will discuss how we can infer bulk velocities and velocity dispersions across key structures such as cold fronts, downstream wakes, and disturbed cores. Particular emphasis will be placed on diagnosing where coherent motions dominate and where turbulent broadening is enhanced, identifying multi-component velocity structures along the line of sight by offset-merger (e.g., Omiya et al. 2024), and linking the measured kinematics to interface physics. I will compare the XRISM-derived kinematics with high-sensitivity radio maps of diffuse emission, to test whether radio brightening traces turbulence-driven (re)acceleration in the wake (Omiya, PhD thesis, 2026).
 

The webinar connection details are as follows:

https://rediris.zoom.us/j/93279205323?pwd=oQKcJaDrkqyi7OT0ry1GlPvGrHj4OH.1

ID meeting: 932 7920 5323

Passcode: 394276

Recorded webinars

They are publicly distributed in this dedicated playlist on the ACO YouTube channel.

Presentations

The PDF versions of the presentations can be downloaded individually at the links given below:

 

Code of conduct

All participants in the seminar series are expected to behave professionally and respectfully with other colleagues. Some basic guidelines are:

  • Behave professionally. Refrain from harassment in any form, avoiding offensive comments about individual characteristics, for example, age, gender, sexual orientation, disability, physical appearance, race, nationality or religion.
  • Ensure all communications are appropriate for a professional audience, taking into account the many different backgrounds of the participants. For example, sexual or sexist language and imagery are not appropriate.
  • Be respectful and do neither insult the participants or the facilitators of the webinars.
  • Critique ideas, not people.

Based on the code of conduct of XMM-Newton workshops.

Scientific Organising Committee

Laura Brenneman (CfA), Nanda Rea (ICE-CSIC), Aurora Simionescu (SRON), and the Athena Community Office (ACO).