The abundance and clustering of dark haloes in the standard Lambda CDM cosmogony

Details The abundance and clustering of dark haloes in the standard Lambda CDM cosmogony The abundance and clustering of dark haloes in the standard Lambda CDM cosmogony

2002-02-21

arxiv.org/abs/astro-ph/0202393v2

Mon.Not.Roy.Astron.Soc.336:112,2002

Astronomy and Astrophysics

Astrophysics

10 pages, 2 ps figures, version to be published in MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05723.x

Much evidence suggests that we live in a flat Cold Dark Matter universe with a cosmological constant. Accurate analytic formulae are now available for many properties of the dark halo population in such a Universe. Assuming current ``concordance'' values for the cosmological parameters, we plot halo abundance against redshift as a function of halo mass, of halo temperature, of the fraction of cosmic matter in haloes, of halo clustering strength, and of the clustering strength of the z=0 descendants of high redshift haloes. These plots are useful for understanding how nonlinear structure grows in the model. They demonstrate a number of properties which may seem surprising, for example: 10^9 solar mass haloes are as abundant at z=20 as L_* galaxies are today; 10^6K haloes are equally abundant at z=8 and at z=0; 10% of all matter is currently in haloes hotter than 1 keV, while more than half is in haloes too cool to trap photo-ionized gas; 1% of all matter at z=15 is in haloes hot enough to ionise hydrogen; haloes of given mass or temperature are more clustered at higher redshift; haloes with the abundance of present-day L_* galaxies are equally clustered at all z<20; the metals produced by star-formation at z>10 are more clustered at z=0 than are L_* galaxies.

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