A unified solution to the small scale problems of the $\Lambda$CDM model II: introducing parent-satellite interaction
Abstract
We continue the study of the impact of baryon physics on the small scale problems of the CDM model, based on a semi-analytical model (Del Popolo, 2009). Withsuch model, we show how the cusp/core, missing satellite (MSP), Too Big to Fail (TBTF) problems and the angular momentum catastrophe can be reconciled with observations, adding parent-satellite interaction. Such interaction between darkmatter (DM) and baryons through dynamical friction (DF) can sufficiently flattenthe inner cusp of the density profiles to solve the cusp/core problem. Combining, in our model, a Zolotov et al. (2012)-like correction, similarly to Brooks et al. (2013), and effects of UV heating and tidal stripping, the number of massive, luminous satellites, as seen in the Via Lactea 2 (VL2) subhaloes,is in agreement with the numbers observed in the MW, thus resolving the MSP and TBTF problems. The model also produces a distribution of the angular spin parameter and angular momentum in agreement with observations of the dwarfs studied by van den Bosch, Burkert, \\& Swaters (2001).
Cite
@article{arxiv.1408.4893,
title = {A unified solution to the small scale problems of the $\Lambda$CDM model II: introducing parent-satellite interaction},
author = {Antonino Del Popolo and Morgan Le Delliou},
journal= {arXiv preprint arXiv:1408.4893},
year = {2015}
}
Comments
24pp, 5figs. arXiv admin note: text overlap with arXiv:1404.3674