Halo occupation distribution
{{Short description|Parameter of the halo model of galaxy clustering}}
The halo occupation distribution (HOD) is a parameter of the halo model of galaxy clustering.
{{cite book
| last1 = Martinez | first1 = Vicent J.
| first2 = Enn | last2 = Saar
| orig-year = 2001
| date = 2002
| chapter = Chapter 7: Random Fields in Cosmology
| chapter-url = https://books.google.com/books?id=f-l9bB-7AQMC&pg=PA187
| title = Statistics of the Galaxy Distribution
| url = https://books.google.com/books?id=f-l9bB-7AQMC
| pages = 232–237
| publisher = CRC Press
| isbn = 978-1-58488-084-4
}} Note: See section 7.8: Halo Model of Galaxy Clustering 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.{{cite journal
| last = Zheng | first = Zheng
| author2 = A.A. Berlind
| author3 = D.H. Weinberg
| author4 = A.J. Benson
| author5 = C.M. Baugh
| author6 = S. Cole
| author7 = R. Davé
| author8 = C.S. Frenk
| author9 = N. Katz
| author10 = C.G. Lacey
| display-authors = 8
| date = 2005
| title = Theoretical Models of the Halo Occupation Distribution: Separating Central and Satellite Galaxies
| journal = The Astrophysical Journal
| volume = 633 | issue = 2 | pages = 791–809
| arxiv = astro-ph/0408564
| bibcode=2005ApJ...633..791Z
| doi = 10.1086/466510
| s2cid = 2286180
}} 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.
{{cite journal
| last = Berlind | first = Andreas A.
|author2=David H. Weinberg
| date = 2002
| title = The Halo Occupation Distribution: Toward an Empirical Determination of the Relation between Galaxies and Mass
| journal = Astrophysical Journal
| volume = 575 | issue = 2 | pages = 587–616
| arxiv = astro-ph/0109001
| bibcode=2002ApJ...575..587B
| doi = 10.1086/341469
| s2cid = 16067136
}}