The Outer Halos of Very Massive Galaxies: BCGs and their DSC in the Magneticum Simulations
Faculty of Physics, Universitäts-Sternwarte München, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 München, Germany
Max Planck Institut for Astrophysics, D-85748 Garching, Germany
Author to whom correspondence should be addressed.
Academic Editors: Duncan A. Forbes and Ericson D. Lopez
Received: 1 August 2017 / Revised: 24 August 2017 / Accepted: 28 August 2017 / Published: 1 September 2017
Recent hydrodynamic cosmological simulations cover volumes up to Gpc
and resolve halos across a wide range of masses and environments, from massive galaxy clusters down to normal galaxies, while following a large variety of physical processes (star-formation, chemical enrichment, AGN feedback) to allow a self-consistent comparison to observations at multiple wavelengths. Using the Magneticum simulations, we investigate the buildup of the diffuse stellar component (DSC) around massive galaxies within group and cluster environments. The DSC in our simulations reproduces the spatial distribution of the observed intracluster light (ICL) as well as its kinematic properties remarkably well. For galaxy clusters and groups we find that, although the DSC in almost all cases shows a clear separation from the brightest cluster galaxy (BCG) with regard to its dynamic
state, the radial stellar density
distribution in many halos is often characterized by a single Sérsic profile, representing both the BCG component and the DSC, very much in agreement with current observational results. Interestingly, even in those halos that clearly show two components in both the dynamics and the spatial distribution of the stellar component, no correlation between them is evident.
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Remus, R.-S.; Dolag, K.; Hoffmann, T.L. The Outer Halos of Very Massive Galaxies: BCGs and their DSC in the Magneticum Simulations. Galaxies 2017, 5, 49.
Remus R-S, Dolag K, Hoffmann TL. The Outer Halos of Very Massive Galaxies: BCGs and their DSC in the Magneticum Simulations. Galaxies. 2017; 5(3):49.
Remus, Rhea-Silvia; Dolag, Klaus; Hoffmann, Tadziu L. 2017. "The Outer Halos of Very Massive Galaxies: BCGs and their DSC in the Magneticum Simulations." Galaxies 5, no. 3: 49.
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