Determination of halo occupation distribution: Comparison between mock and observational catalogues

FACUNDO RODRIGUEZ; MANUEL MERCHÁN

Santiago de Chile

Workshop; Mock Santiago: preparing for the next generation surveys; 2016

Centro de Astro-Ingeniería Universidad Católica e Instituto de Astrofísica de la Universidad Católica

Halo occupation distribution (HOD) is a powerful statistic that allows the study of several aspects of the matter distribution in the Universe, such as evaluating semi-analytic models of galaxy formation or imposing constraints on cosmological models. This work is part of apaper already published [3] where we use a background subtraction technique to combine information provided by spectroscopic galaxy groups and photometric survey of galaxies. We implement the proposed technique on a mock catalogue built from a semi-analyticmodel of galaxy formation. Furthermore, we apply the method to the SDSS DR7 using a galaxy group catalogue taken from spectroscopic version and the corresponding photometric galaxy survey. Finally, we compare the results obtained from synthetic and realcatalogues.