A unified solution to the small scale problems of the Lambda CDM model II: introducing parent-satellite interaction

作者：Del Popolo A^*; Le Delliou M

来源：Journal of Cosmology and Astroparticle Physics, 2014, 2014(12): 051.

DOI：10.1088/1475-7516/2014/12/051

• dark matter theory
• galaxy evolution
• galaxy formation

We continue the study of the impact of baryon physics on the small scale problems of the Lambda CDM model, based on a semi-analytical model (Del Popolo, 2009). With such 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 dark matter (DM) and baryons through dynamical friction (DF) can sufficiently flatten the 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, %26 Swaters (2001).

• 出版日期2014-12