Dr Matthieu Schaller matthieu.schaller@durham.ac.uk
Academic Visitor
The effect of baryons on the inner density profiles of rich clusters
Schaller, Matthieu; Frenk, Carlos S.; Bower, Richard G.; Theuns, Tom; Trayford, James W.; Crain, Robert A.; Furlong, Michelle; Schaye, Joop; Dalla Vecchia, Claudio; McCarthy, Ian G.
Authors
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
Richard G. Bower
Professor Tom Theuns tom.theuns@durham.ac.uk
Professor
James W. Trayford
Robert A. Crain
Michelle Furlong
Joop Schaye
Claudio Dalla Vecchia
Ian G. McCarthy
Abstract
We use the ‘Evolution and assembly of galaxies and their environments’ (EAGLE) cosmological simulation to investigate the effect of baryons on the density profiles of rich galaxy clusters. We focus on EAGLE clusters with M200 > 1014 M⊙ of which we have six examples. The central brightest cluster galaxies (BCGs) in the simulation have steep stellar density profiles, ρ*(r) ∝ r−3. Stars dominate the mass density for r < 10 kpc, and, as a result, the total mass density profiles are steeper than the Navarro–Frenk–White (NFW) profile, in remarkable agreement with observations. The dark matter halo itself closely follows the NFW form at all resolved radii (r ≳ 3.0 kpc). The EAGLE BCGs have similar surface brightness and line-of-sight velocity dispersion profiles as the BCGs in the sample of Newman et al., which have the most detailed measurements currently available. After subtracting the contribution of the stars to the central density, Newman et al. infer significantly shallower slopes than the NFW value, in contradiction with the EAGLE results. We discuss possible reasons for this discrepancy, and conclude that an inconsistency between the kinematical model adopted by Newman et al. for their BCGs, which assumes isotropic stellar orbits, and the kinematical structure of the EAGLE BCGs, in which the orbital stellar anisotropy varies with radius and tends to be radially biased, could explain at least part of the discrepancy.
Citation
Schaller, M., Frenk, C. S., Bower, R. G., Theuns, T., Trayford, J. W., Crain, R. A., …McCarthy, I. G. (2015). The effect of baryons on the inner density profiles of rich clusters. Monthly Notices of the Royal Astronomical Society, 452(1), 343-355. https://doi.org/10.1093/mnras/stv1341
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 14, 2015 |
Publication Date | Sep 1, 2015 |
Deposit Date | Oct 22, 2015 |
Publicly Available Date | Nov 5, 2015 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 452 |
Issue | 1 |
Pages | 343-355 |
DOI | https://doi.org/10.1093/mnras/stv1341 |
Keywords | Galaxies: clusters: general, Galaxies: haloes, Cosmology: theory, Dark matter. |
Related Public URLs | http://arxiv.org/abs/1409.8297 |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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