Speaker
Description
The unified distribution model of cold dark matter (CDM) subhaloes is extended to the warm dark matter (WDM) case using a series of high-resolution N-body simulations with different WDM particle masses. 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 models. Compared with the CDM model, the WDM model differs most notably in two aspects: 1) In contrast to the power-law form in CDM, the unevolved subhalo mass function for WDM is suppressed at the low mass end due to the cut-off in the power spectrum. 2) WDM subhaloes are more vulnerable to tidal stripping and disruption due to their lower concentrations at accretion time. These differences result in a mass-dependent spatial distribution of WDM subhaloes which also depends on the WDM particle mass, while both dependences are well reproduced by our model.
