SCIENTIA SINICA Physica, Mechanica & Astronomica, Volume 47 , Issue 4 : 049806(2017) https://doi.org/10.1360/SSPMA2016-00350

Statistical relation between galaxy and subhalo

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  • ReceivedJul 29, 2016
  • AcceptedAug 18, 2016
  • PublishedJan 5, 2017
PACS numbers


N-body simulations can now be carried out with resolution high enough to track the histories of individual substructures (subhaloes) within the surrounding dark matter haloes. Compared with dark matter haloes, subhaloes are thought to be connected more tightly with galaxies. With the tight connection, models are developed to study the relation between galaxy properties and subhalo properties in a statistical way. This methodology falls midway between the traditional halo occupation distribution (HOD) approach and the galaxy formation semi-analytic approach. The positions and velocities of galaxies within a halo are predicted by following the orbits and merging histories of the substructures in simulations. Rather than using star formation and feedback recipes to specify the physical properties of galaxies such as stellar mass, luminosity, color, etc., parameterized functions are adopted to relate these properties to the properties of their host subhaloes directly. In this review, we summarize the models of linking galaxies with subhaloes, and introduce their advantages. We also point out the limits of this methodology, which need to be treated with caution when using and applying it.

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