Conveners
Galaxies 5
- Zhongxu Zhai (Shanghai Jiao Tong University)
The magnitude gap between the central and satellite galaxies encodes information about the mass accretion history of a dark matter halo, and serves as a useful observational probe for the mass distribution in a halo. In this work, we perform the first weak lensing test of the connections between the magnitude gap and the halo profile. We measure the halo profiles of isolated central galaxies...
Conditional Luminosity Function (CLF) means the Luminosity Function (LF) of a similar dark halo mass. It is more meaningful from the perspective of the galaxy-halo connection. CLFs of halo mass $M_h > 10^{12} 𝑀_\odot$ at z~0 have been measured down to rather faint luminosity reliably. In this work, we combined the DESI SV3 spectroscopic group central galaxies and the HSC photometric galaxies,...
Morphology is one of the fundamental characteristics of galaxies, yet reproducing it has long been a challenge for semi-analytic models. These models typically overpredict bulge-dominated massive galaxies and disk-dominated low-mass galaxies. I will introduce how we improve the model performance by modifying the bulge formation through galaxy mergers.
The improved approach takes use of the...
Understanding how galaxies form and evolve is essential for advancing our knowledge of cosmic structure formation. However, generating large ensembles of mock galaxy catalogs through traditional semi-analytic models (SAMs) remains computationally prohibitive, especially when exploring wide ranges of physical parameters. In this work, we present a graph-neural-network-based emulator that...
