Publication: A unified solution to the small scale problems of the Lambda CDM model II: introducing parent-satellite interaction
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Iop Publishing Ltd
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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).
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Dark matter theory, Galaxy evolution, Galaxy formation
Language
English
Citation
Journal Of Cosmology And Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 12, p. 1-26, 2014.
