Halo occupation distribution explained

The halo occupation distribution (HOD) is a parameter of the halo model of galaxy clustering.^[1] The halo model provides one view of the large scale structure of the universe as clumps of dark matter, while the HOD provides a view of how galactic matter is distributed within each of the dark matter clumps.^[2] The HOD is used to describe three related properties of the halo model: the probability distribution relating the mass of a dark matter halo to the number of galaxies that form within that halo; the distribution in space of galactic matter within a dark matter halo; the distribution of velocities of galactic matter relative to dark matter within a dark matter halo.^[3]

See also

• Dark matter
• Large-scale structure of the cosmos
• Galaxy formation and evolution

Notes and References

1. Book: Martinez . Vicent J. . Enn . Saar . 2001 . 2002 . Chapter 7: Random Fields in Cosmology . https://books.google.com/books?id=f-l9bB-7AQMC&pg=PA187 . Statistics of the Galaxy Distribution . 232 - 237 . . 978-1-58488-084-4. Note: See section 7.8: Halo Model of Galaxy Clustering
2. Zheng . Zheng . A.A. Berlind . D.H. Weinberg . A.J. Benson . C.M. Baugh . S. Cole . R. Davé . C.S. Frenk . N. Katz . C.G. Lacey . 8 . 2005 . Theoretical Models of the Halo Occupation Distribution: Separating Central and Satellite Galaxies . . 633 . 2 . 791 - 809 . astro-ph/0408564 . 2005ApJ...633..791Z . 10.1086/466510. 2286180 .
3. Berlind . Andreas A. . David H. Weinberg . 2002 . The Halo Occupation Distribution: Toward an Empirical Determination of the Relation between Galaxies and Mass . . 575 . 2 . 587 - 616 . astro-ph/0109001 . 2002ApJ...575..587B . 10.1086/341469. 16067136 .