Conveners
Boundaries in different tracers
- Xun Shi
Boundaries in different tracers
- Xun Shi
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...
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...
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...
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...
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...
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...
