Semi analytical description of formation of galaxies and clusters of galaxies

TL;DR

This paper uses a semi analytical model to study the formation and evolution of dark matter dominated galaxies and clusters, linking observed properties to initial density perturbations within the b1CDM framework.

Contribution

It applies a semi analytical approach to connect the characteristics of relaxed dark matter halos with the initial power spectrum of density fluctuations.

Findings

Observed properties of 41 dSph galaxies align with b1CDM predictions.

Data from c 300 galaxy clusters support the b1CDM power spectrum down to 10 kpc scales.

The model provides a simple description of the evolution of the first galaxies.

Abstract

We apply the well known semi analytical model of formation of DM halos to discuss the process of formation and evolution of the relaxed objects dominated by the DM component (such as the first and dSph galaxies and clusters of galaxies). On the one hand this approach allows us to obtain a simple description of evolution of the first galaxies. On the other hand it reveals links between the observed characteristics of the relaxed DM halos and the initial power spectrum of density perturbations. Results of our analysis of the observed properties of 41 DM dominated dSph galaxies and data of $\sim 300$ clusters of galaxies are consistent with the $\Lambda$CDM like power spectrum of initial perturbations down to the scale of $\sim 10kpc$.