Conveners
Boundaries in different tracers
- Xun Shi
Boundaries in different tracers
- Xun Shi
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Daisuke Nagai (Yale University)5/30/25, 9:00 AMTalk
Recent advances in simulations and observations of galaxy clusters suggest the existence of a physical outer boundary for massive cluster-sized dark matter (DM) halos. Large-scale structures, including halo and cosmic-web boundaries, significantly influence splashback and shock phenomena. Using the Omega500 zoom-in hydrodynamical cosmological simulations, we found that the accretion shock...
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Go Ogiya (Zhejiang University)5/30/25, 9:30 AMBoundaries in different tracersTalk
The origin of turbulent motion of the intracluster medium (ICM) has been a longstanding open question, and X-ray observations of the new generation, such as XRISM and eROSITA, shed further light on it. Stirring by substructures (member galaxies and dark matter subhaloes) orbiting within a galaxy cluster is a possible mechanism to generate and maintain the ICM turbulence. We develop a...
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Prof. Xin Wang (Sun Yat-sen University)5/30/25, 9:50 AMBoundaries in different tracersTalk
After shell-crossing, cosmic flows exhibit diverse rotational morphologies driven by stream-mixing processes. Vorticity generation is intricately linked to the large-scale structure of the universe, with distinct flow patterns emerging around halos, filaments, and voids. A detailed analysis of flow morphology around halos reveals a sharp transition in the logarithmic derivative of the volume...
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Erwin Lau5/30/25, 10:30 AMTalk
We present the latest development of "Baryon Pasting", a novel framework that adopts a physics-based approach for forward-modeling SZ and X-ray observations of galaxy clusters and groups. Baryon Pasting enables efficient exploration of the vast astrophysical and cosmological parameter space required for current and upcoming millimeter-wave surveys, such as the Simons Observatory and CMB-S4,...
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Kris Walker (The International Centre for Radio Astronomy Research, University of Western Australia)5/30/25, 11:00 AMBoundaries in different tracersTalk
The relationship between the visible and dark components of galaxies is a complex function of mass, accretion history, and galaxy formation physics. Nevertheless, recent work using simulated galaxy clusters has shown that stars can be an accurate tracer of the splashback boundary of the dark matter halo, potentially providing a robust way to infer the dark matter in observations. Building on...
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Mr Zeyu Chen (中国科学技术大学)5/30/25, 11:20 AMBoundaries in different tracersTalk
The Circumgalactic Medium (CGM), as a key interface connecting galaxies to the cosmic web, has its metal distribution and evolution directly reflecting the dynamical processes of halo boundaries. Using early data from the Dark Energy Spectroscopic Instrument (DESI), we analyze the equivalent widths (W) of 33 metal absorption lines to reveal the spatiotemporal evolution of the CGM and its...
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Yu Qiu (Center for Cosmology and Computational Astrophysics, Institute for Advanced Study in Physics, Zhejiang Univeristy)5/30/25, 11:40 AMBoundaries in different tracersTalk
Relativistic jets are an essential channel accreting SMBHs release feedback energy to the host galaxies. Observationally, the radio lobes inflated by AGN jets extend to megaparsec scales, far beyond the virial radii of the hosts to interact with nearby galaxies. Theoretically, the magnetic field within the radio lobes can impact the growth and the dynamical evolution of galaxies, especially in...
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