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Modelling galaxy clustering by colour
Authors:Ryan Scranton
Institution:Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA and; NASA/Fermilab Astrophysics Center, PO Box 500, Batavia, IL 60510, USA
Abstract:We extend the mass-halo formalism for analytically generating power spectra to allow for the different clustering behaviour observed in galaxy subpopulations. Although applicable to other separations, we concentrate our methods on a simple separation by rest-frame colour into 'red' and 'blue' subpopulations through modifications to the 〈 N 〉( M ) relations and halo distribution functions for each of the subpopulations. This sort of separation is within the capabilities of the current generations of simulations as well as galaxy surveys, suggesting a potentially powerful observational constraint for current and future simulations. In anticipation of this, we demonstrate the sensitivity of the resulting power spectra to the choice of model parameters.
Keywords:methods: numerical  large-scale structure of Universe
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