The Age Dependence of Galaxy Clustering

Details The Age Dependence of Galaxy Clustering The Age Dependence of Galaxy Clustering

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919704r&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #197.04; Bulletin of the American Astronomical Society,

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We construct mock galaxy catalogues to analyse clustering properties of a Lambda cold dark matter (LCDM) universe within a cosmological dark matter simulation of sufficient resolution to resolve structure down to the scale of dwarfs. We show that the age-clustering correlation, recently found among discrete virialized haloes by Gao et al., is strong for objects likely to host luminous galaxies, which includes the satellite halo (subhalo) population.
Older mock galaxies are significantly more clustered in our catalog, which consists of satellite haloes as well as the central peaks of discrete haloes, selected solely by peak circular velocity. This suggests that the clustering age dependence is manifested in real galaxies. At small scales (less than 5 Mpc/h), the very simple assumption that galaxy colour depends solely on halo age is inconsistent with the strength of the observed clustering colour trends, where red galaxies become increasingly more clustered than blue galaxies toward smaller scales, suggesting that luminosity weighted galaxy ages do not closely trace the assembly epoch of their dark matter hosts. The age dependence is present but is weaker for satellite haloes lying within groups and clusters than for the global population.

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