Artículos de revistas
A unified solution to the small scale problems of the Lambda CDM model II: introducing parent-satellite interaction
Fecha
2014-12-01Registro en:
Journal Of Cosmology And Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 12, p. 1-26, 2014.
1475-7516
10.1088/1475-7516/2014/12/051
WOS:000350115800020
Autor
Univ Catania
Ist Nazl Fis Nucl
Universidade Federal dp Rio Grande do Norte (UFRN)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
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).