A.E. Evrard
Virial Scaling of Massive Dark Matter Halos: Why Clusters Prefer a High Normalization Cosmology
Evrard, A.E.; Bialek, J.; Busha, M.; White, M.; Habib, S.; Heitmann, K.; Warren, M.; Rasia, E.; Tormen, G.; Moscardini, L.; Power, C.; Jenkins, A.R.; Gao, L.; Frenk, C.S.; Springel, V.; White, S.D.M.; Diemand, J.
Authors
J. Bialek
M. Busha
M. White
S. Habib
K. Heitmann
M. Warren
E. Rasia
G. Tormen
L. Moscardini
C. Power
Professor Adrian Jenkins a.r.jenkins@durham.ac.uk
Professor
L. Gao
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
V. Springel
S.D.M. White
J. Diemand
Abstract
We present a precise estimate of the bulk virial scaling relation of halos formed via hierarchical clustering in an ensemble of simulated cold dark matter cosmologies. The result is insensitive to cosmological parameters; the presence of a trace, dissipationless gas component; and numerical resolution down to a limit of 1000 particles. The dark matter velocity dispersion scales with total mass as log½ ¼ DM(M;z) log (1082:9 4:0 km s1) þ (0:3361 0:0026)log h(z)M200 /10 ½ 15 M , with h(z) being the dimensionless Hubble parameter. At fixed mass, the velocity dispersion likelihood is nearly lognormal, with scatter ln ¼ 0:0426 0:015, except for a tail with higher dispersions containing 10% of the population that are merger transients. We combine this relation with the halo mass function in CDM models and show that a low normalization condition, S8 ¼ 8(m /0:3)0:35 ¼ 0:69, favored by recent WMAP and SDSS analysis requires that galaxy and gas-specific energies in rich clusters be 50% larger than that of the underlying dark matter. Such large energetic biases are in conflict with the current generation of direct simulations of cluster formation. A higher normalization, S8 ¼ 0:80, alleviates this tension and implies that the hot gas fraction within r500 is (0:71 0:09) h3=2 70 b /m, a value consistent with recent Sunyaev-Zel’dovich observations.
Citation
Evrard, A., Bialek, J., Busha, M., White, M., Habib, S., Heitmann, K., …Diemand, J. (2008). Virial Scaling of Massive Dark Matter Halos: Why Clusters Prefer a High Normalization Cosmology. Astrophysical Journal, 672(1), 122-137. https://doi.org/10.1086/521616
Journal Article Type | Article |
---|---|
Publication Date | Jan 1, 2008 |
Deposit Date | Feb 27, 2012 |
Publicly Available Date | Apr 20, 2016 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 672 |
Issue | 1 |
Pages | 122-137 |
DOI | https://doi.org/10.1086/521616 |
Files
Published Journal Article
(1.1 Mb)
PDF
Copyright Statement
© 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A.
You might also like
Formation of massive disc galaxies in the IllustrisTNG simulation
(2021)
Journal Article
Constraining the inner density slope of massive galaxy clusters
(2020)
Journal Article
Ultra-diffuse galaxies in the Auriga simulations
(2019)
Journal Article
Dark-matter-deficient galaxies in hydrodynamical simulations
(2019)
Journal Article
The optimal gravitational softening length for cosmological N-body simulations
(2019)
Journal Article