Profiles of dark haloes: evolution, scatter and environment
James S. Bullock,James S. Bullock,Tsafrir S. Kolatt,Tsafrir S. Kolatt,Yair Sigad,Rachel S. Somerville,Rachel S. Somerville,Andrey V. Kravtsov,Andrey V. Kravtsov,Anatoly Klypin,Joel R. Primack,Avishai Dekel +11 more
Reads0
Chats0
TLDR
In this paper, the authors studied the dark-matter halo density profiles in a high-resolution N-body simulation of a CDM cosmology and found that the redshift dependence of the median concentration is cvirRvir/rs.Abstract:
We study dark-matter halo density profiles in a high-resolution N-body simulation of aCDM cosmology. Our statistical sample contains �5000 haloes in the range 10 11 10 14 h −1 M⊙ and the resolution allows a study of subhaloes inside host haloes. The profiles are parameterized by an NFW form with two parameters, an inner radius rs and a virial radius Rvir, and we define the halo concentration cvirRvir/rs. We find that, for a given halo mass, the redshift dependence of the median concentration is cvir / (1 + z) −1 . This corresponds to rs(z) � constant, and is contrary to earlier suspicions that cvir does not vary much with redshift. The implications are that high- redshift galaxies are predicted to be more extended and dimmer than expected before. Second, we find that the scatter in halo profiles is large, with a 1� �(logcvir) = 0.18 at a given mass, corresponding to a scatter in maximum rotation velocities of �Vmax/Vmax = 0.12. We discuss implications for modelling the Tully-Fisher relation, which has a smaller reported intrinsic scatter. Third, subhaloes and haloes in dense environments tend to be more concentrated than isolated haloes, and show a larger scatter. These results suggest that cvir is an essential parameter for the theory of galaxy modelling, and we briefly discuss implications for the universality of the Tully- Fisher relation, the formation of low surface brightness galaxies, and the origin of the Hubble sequence. We present an improved analytic treatment of halo formation that fits the measured relations between halo parameters and their redshift dependence, and can thus serve semi-analytic studies of galaxy formation.read more
Citations
More filters
Journal ArticleDOI
How do galaxies get their gas
TL;DR: In this article, the authors show that at low z < 1, the cosmic star formation rate degrades due to geometry, as the typical cross section of filaments begins to exceed that of the galaxies at their intersections.
Journal ArticleDOI
The Aquarius Project: the subhaloes of galactic haloes
Volker Springel,Jie Wang,Mark Vogelsberger,Aaron D. Ludlow,Adrian Jenkins,Amina Helmi,Julio F. Navarro,Julio F. Navarro,Carlos S. Frenk,Simon D. M. White +9 more
TL;DR: In this article, the authors performed the largest ever particle simulation of a Milky Way sized dark matter halo, and presented the most comprehensive convergence study for an individual dark mass halo carried out thus far.
Journal ArticleDOI
Toward a halo mass function for precision cosmology: The Limits of universality
Jeremy L. Tinker,Andrey V. Kravtsov,Anatoly Klypin,Kevork N. Abazajian,Michael S. Warren,Gustavo Yepes,Stefan Gottlöber,Daniel E. Holz +7 more
TL;DR: In this paper, the mass function of dark matter halos is measured in a large set of collisionless cosmological simulations of flat ΛCDM cosmology and investigated its evolution at -->z 2.5.
Journal ArticleDOI
Galaxy bimodality due to cold flows and shock heating
Avishai Dekel,Yuval Birnboim +1 more
TL;DR: In this paper, the authors address the origin of the robust bimodality observed in galaxy properties about a characteristic stellar mass ∼3 x 10 10 10 M ⊙, and propose that these features are driven by the thermal properties of the inflowing gas and their interplay with the clustering and feedback processes, all functions of the dark matter halo mass associated with a similar characteristic scale.
Journal ArticleDOI
Erratum: "Chandra Sample of Nearby Relaxed Galaxy Clusters: Mass, Gas Fraction, and Mass-Temperature Relation"
Alexey Vikhlinin,Andrey V. Kravtsov,William R. Forman,C. Jones,Maxim Markevitch,S. S. Murray,L. van Speybroeck +6 more
TL;DR: In this paper, gas and total mass profiles for 13 low-redshift, relaxed clusters spanning a temperature range 0.7-9 keV were derived from all available Chandra data of sufficient quality.
References
More filters
Journal ArticleDOI
A Universal Density Profile from Hierarchical Clustering
TL;DR: In this article, the authors used high-resolution N-body simulations to study the equilibrium density profiles of dark matter halos in hierarchically clustering universes, and they found that all such profiles have the same shape, independent of the halo mass, the initial density fluctuation spectrum, and the values of the cosmological parameters.
Journal ArticleDOI
The Structure of cold dark matter halos
TL;DR: In this article, high-resolution N-body simulations show that the density profiles of dark matter halos formed in the standard CDM cosmogony can be fit accurately by scaling a simple universal profile.
Journal ArticleDOI
Formation of Galaxies and Clusters of Galaxies by Self-Similar Gravitational Condensation
Journal ArticleDOI
Core condensation in heavy halos: a two-stage theory for galaxy formation and clustering
Simon D. M. White,Martin J. Rees +1 more
Journal ArticleDOI
Galaxy morphology in rich clusters: Implications for the formation and evolution of galaxies
TL;DR: In this paper, a study of the galaxy populations in 55 rich clusters is presented together with a discussion of the implications for the formation and/or evolution of different morphological types.