Barions and $\Lambda$CDM Model Problems

Abstract

We examine the inner profiles of the rotation curves of galaxies in the velocity range from dwarf galaxies to Milky-way like galaxies, having maximum of rotation, $V_{\max }$, in the range [30-250] km/s, whose diversity is much larger than that predicted by the $\Lambda$CDM model. After showing that the scatter in the observed rotation curves is much larger that that predicted by dark matter-only cosmologies, we show how taking into account baryons, through a semi-analytical code, allows to create a a variety of rotation curves in agreement with observation. Simultaneoulsy, we show that the the quoted discrepancy does not need for different form of dark matter as advocated by [1], and [2]. We finally show how our model can reobtain the rotation curve of remarkable outliers like IC 2574, a 8 kpc cored profile having a challenging, and extremely low rising rotation curve, and UGC 5721 a cusp-like rotation curve galaxy. We suggest treating baryonic physics properly before introducing new exotic features, albeit legitimate, in the standard cosmological model

arXiv comment15pp 6figs, published in Astronomy Reports. arXiv admin note: substantial text overlap with arXiv:2108.07447

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