On the coherent rotation of diffuse matter in numerical simulations of clusters of galaxies
| Autor: | Luca Lamagna, Federico Sembolini, Elena Rasia, Gustavo Yepes, Marco De Petris, Anna Silvia Baldi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
galaxies: clusters: general methods: numerical – cosmolog miscellaneous – cosmology: theory Angular momentum 010308 nuclear & particles physics Dark matter Velocity dispersion Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics methods: numerical – cosmolog 01 natural sciences Specific relative angular momentum Galaxy Space and Planetary Science galaxies: clusters: general Intracluster medium 0103 physical sciences Radiative transfer miscellaneous – cosmology: theory 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy cluster |
| Popis: | We present a study on the coherent rotation of the intracluster medium and dark matter components of simulated galaxy clusters extracted from a volume-limited sample of the MUSIC project. The set is re-simulated with three different recipes for the gas physics: $(i)$ non-radiative, $(ii)$ radiative without AGN feedback, and $(iii)$ radiative with AGN feedback. Our analysis is based on the 146 most massive clusters identified as relaxed, 57 per cent of the total sample. We classify these objects as rotating and non-rotating according to the gas spin parameter, a quantity that can be related to cluster observations. We find that 4 per cent of the relaxed sample is rotating according to our criterion. By looking at the radial profiles of their specific angular momentum vector, we find that the solid body model is not a suitable description of rotational motions. The radial profiles of the velocity of the dark matter show a prevalence of the random velocity dispersion. Instead, the intracluster medium profiles are characterized by a comparable contribution from the tangential velocity and the dispersion. In general, the dark matter component dominates the dynamics of the clusters, as suggested by the correlation between its angular momentum and the gas one, and by the lack of relevant differences among the three sets of simulations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|