Conveners
Observational measurements
- Eduardo Rozo (University of Arizona)
Observational measurements
- Eduardo Rozo (University of Arizona)
The splashback radius is a physically motivated boundary of galaxy clusters, offering a unique window into the cluster's mass accretion rate and the interplay between dark matter and baryonic processes. Consequently, accurate measurements of the splashback radius are crucial for testing cosmological models and advancing our understanding of structure formation. With the advent of large-scale...
To avoid the pseudo-evolution problem of the traditionally defined halo mass and radius, we measure the splash-back radius (Rsp), a physically defined halo radius for many halos, using the shear catalog of the DECaLS DR8. The dark matter halos cover the mass of 10^13 - 3 × 10^15Msun and the redshift of 0.08–0.65. Our finding reveals a trend wherein massive halos demonstrate a larger Rsp, and...
Weak gravitational lensing is a crucial tool to measure the mass profiles of dark matter halos. I will discuss a recent weak-lensing analysis of isolated galaxies in KiDS DR4 that finds flat circular velocities out to very large galactocentric radii (at least 300kpc), suggesting that the dark matter halos of galaxies are more extended than expected. Futhermore, these dark matter profiles...
Cosmic filaments represent the sites where the majority of galaxies in the universe form. However, the structure of filaments themselves, and the link between physical properties of galaxies and their spatial distribution within the filaments remain unclear. Here based on deep multi-wavelength data in the COSMOS and SDSS surveys, we characterize projected radial profiles (2-dimension) of...
I will present a comprehensive analysis of weak gravitational lensing data to assess mass biases in galaxy clusters and characterize their splashback radius, with implications for precision cluster cosmology.
Systematic assessments using state-of-the-art hydrodynamical simulations reveal that weak lensing mass biases depend on cluster mass, redshift, and orientation, with biases as high as...
