The 2nd Shanghai Assembly on Cosmology and Structure Formation

Session

halo: satellite distribution

Nov 1, 2023, 9:00 AM

Conference Hall (TD Lee Library)

Conveners

halo: satellite distribution

• Fangzhou Jiang (Peking University)

29. Symfind: The Durability of Subhalos and Fragility of Subhalo Finders

Philip Mansfield (Stanford University)

11/1/23, 9:00 AM

Cosmological Simulation

Talk

A major question in ΛCDM is what this theory truly predicts for the properties of subhalo populations. Subhalos are difficult to simulate and to find within simulations, and this propagates into uncertainty in theoretical predictions for satellite galaxies. I present Symfind, a new particle-tracking-based subhalo finder, and demonstrate that it can track subhalos to orders-of-magnitude lower...

41. The true radial distribution of satellite galaxies around MW-mass halos in LCDM

Isabel Santos-Santos (Institute for Computational Cosmology, Durham University)

11/1/23, 9:25 AM

Small-scale structure

Talk

The Milky Way (MW) galaxy presents a larger number of satellites within 40 kpc than predicted by cosmological simulations of MW halos. If we believe simulation results, one implication is that halos as small as Vpeak~7 km/s should harbour galaxies, which is in contrast to the expectations of most galaxy formation models. On the other hand, idealized simulations predict that the cuspy NFW...

55. Extending the unified subhalo model to warm dark matter

Feihong He (SJTU)

11/1/23, 9:50 AM

Small-scale structure

Talk

Using a set of high-resolution N-body simulations, we extend the unified distribution model of cold dark matter (CDM) subhaloes to the warm dark matter(WDM) case. The same model framework combining the unevolved mass function, unevolved radial distribution, and tidal stripping can predict the mass function and spatial distribution of subhaloes in both CDM and WDM simulations. The dependence of...