Using a semianalytic code, we show how baryon physics in a.CDM cosmology could solve the discrepancy between numerical predictions of dark matter haloes and observations, ranging from dwarf galaxies to clusters, without the need of nonstandard dark matter models as advocated, for example, by [Kaplinghat et al., Phys. Rev. Lett. 116, 041302, (2016)]. Combining well established results, we show, for the first time, how accounting for baryon physics, in particular dynamical friction mechanisms, leads to flat galaxy-cluster profiles and correlations in several of their properties, solves the so-called "diversity problem" and reproduces very well the challenging, extremely low-rising rotation curve of IC2574. We, therefore, suggest treating baryonic physics properly before introducing new exotic features, albeit legitimate, in the standard cosmological model.

Energy transfer from baryons to dark matter as a unified solution to small-scale structure issues of the ΛCDM model

Del Popolo, A.;
2018

Abstract

Using a semianalytic code, we show how baryon physics in a.CDM cosmology could solve the discrepancy between numerical predictions of dark matter haloes and observations, ranging from dwarf galaxies to clusters, without the need of nonstandard dark matter models as advocated, for example, by [Kaplinghat et al., Phys. Rev. Lett. 116, 041302, (2016)]. Combining well established results, we show, for the first time, how accounting for baryon physics, in particular dynamical friction mechanisms, leads to flat galaxy-cluster profiles and correlations in several of their properties, solves the so-called "diversity problem" and reproduces very well the challenging, extremely low-rising rotation curve of IC2574. We, therefore, suggest treating baryonic physics properly before introducing new exotic features, albeit legitimate, in the standard cosmological model.
CUSP-CORE TRANSFORMATIONS, SPHERICAL COLLAPSE MODEL, ACTIVE GALACTIC NUCLEI, GALAXY FORMATION, DWARF GALAXIES, GIANT CLUMPS, COSMOLOGICAL SIMULATIONS, DENSITY PROFILES, ANGULAR-MOMENTUM, STAR-FORMATION.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/358704
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