Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344802s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #448.02; Bulletin of the American Astronomical Society, Vol. 41, p.335
Astronomy and Astrophysics
Astronomy
Scientific paper
A realistic mock catalog is crucial in testing various automated data analysis tools. In this paper, we present a novel galaxy catalog simulator which turns N-body simulations with FoF halo catalogs and IsoDen subhalos into mock skies. We demonstrate that dark matter subhalos can be related to galaxies when the mass resolution is good, so that we don't need to assume any relation between dark matter particles and baryons as in HOD or semi-analytical models. The galaxy simulator assigns galaxy properties to each subhalo in a way that reproduces the galaxy halo occupation distribution in local clusters and the radial and mass dependent variation in fractions of blue galaxies as measured within the SDSS samples, as well as local luminosity functions in both cluster and fields and the color-magnitude relation in clusters, by parametrizing each galaxy property separately. Parametrizing each galaxy property as inputs enables to create mock catalogs with variations in those parameters, which sets the ground for the systematic analysis of the algorithms tested. We present a test case of an application of the mock catalog to a cluster finder that utilizes the red-sequence of clusters as one of the detection criteria. We estimate systematic uncertainties due to the observational variations in input parameters in determining the selection function by using five different sets of modified catalogs. Lastly, the Bgc parameter, an optical mass estimator, is measured and its intrinsic scatter is discussed.
Barkhouse Wayne A.
Mohr Joseph John
Song Jeeseon
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