| Full text | |
| Author(s): |
Del Popolo, A.
;
Le Delliou, M.
Total Authors: 2
|
| Document type: | Journal article |
| Source: | Journal of Cosmology and Astroparticle Physics; v. N/A, n. 12, p. 26-pg., 2014-12-01. |
| Abstract | |
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, & Swaters (2001). (AU) | |
| FAPESP's process: | 11/24089-5 - Astroparticles: cosmology and structures formation - galaxies - clusters |
| Grantee: | Elcio Abdalla |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - International |