The Large-Scale Structure of the Universe
Galaxies are not uniformly distributed in space. On large scales, the Universe displays coherent structure, with galaxies residing in groups and clusters on scales of ∼ 1–3 h − 1 Mpc, which lie at the intersections of long filaments of galaxies that are > 10 h − 1 Mpc in length. Vast regions of relatively empty space, known as voids, contain very few galaxies and span the volume in between these structures. This observed large-scale structure depends both on cosmological parameters and on the formation and evolution of galaxies. Using the two-point correlation function, one can trace the dependence of large-scale structure on galaxy properties, such as luminosity, color, stellar mass, and track its evolution with redshift. Comparison of the observed galaxy clustering signatures with dark matter simulations allows one to model and understand the clustering of galaxies and their formation and evolution within their parent dark matter halos. Clustering measurements can determine the parent dark matter halo mass of a given galaxy population, connect observed galaxy populations at different epochs, and constrain cosmological parameters and galaxy evolution models. This chapter describes the methods used to measure the two-point correlation function in both redshift and real space, presents the current results of how the clustering amplitude depends on various galaxy properties, and discusses quantitative measurements of the structures of voids and filaments. The interpretation of these results with current theoretical models is also presented.
KeywordsDark Matter Galaxy Cluster Stellar Mass Galaxy Formation Dark Matter Halo
The author thanks James Aird, Mirko Krumpe, and Stephen Smith for providing comments on earlier drafts of the text.
- Aragon, van de Weygaert, & Jones, 2010, MNRAS, 408, 2163Google Scholar
- Colless, M., 2004, Cosmological Results from the 2dF Galaxy Redshift Survey, Measuring and Modeling the Universe, ed. Freedman W., Carnegie Observatory Astrophysics Series Vol. 2, Cambridge University Press, 196Google Scholar
- Gregory & Thompson, 1978, ApJ, 222, 784Google Scholar
- Hamilton, A. J. S. 1998, in ASSL Vol. 231: The Evolving Universe, 185Google Scholar
- Joeveer, Einasto, & Tago, 1978, MNRAS, 185, 357Google Scholar
- Peebles, P. J. E. 1980, The Large-Scale Structure of the Universe (Princeton, NJ: Princeton University Press)Google Scholar
- Sandge & Tammann, 1975, ApJ, 196, 313Google Scholar
- Shane, C. D., & Wirtanen, C. A. 1967, in Pub. Lick Obs. Vol. 22, part 1Google Scholar
- Sheth & van de Weygaert, 2004, MNRAS, 350, 517Google Scholar
- Zwicky, F., Herzog, E., & Wild, P. 1968, Catalogue of Galaxies and of Clusters of Galaxies (Pasadena: California Institute of Technology, 1961–1968)Google Scholar