Selection Effects in Galaxy Cluster Surveys: What Do We Learn from Observed Scaling Relations?

Details Selection Effects in Galaxy Cluster Surveys: What Do We Learn from Observed Scaling Relations? Selection Effects in Galaxy Cluster Surveys: What Do We Learn from Observed Scaling Relations?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921504n&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #215.04; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

The plethora of observable quantities across multiple wave bands contains redundant information about the masses of galaxy clusters. Proper calibration across the descriptor set are crucial steps to correctly map the cosmic mass distribution, thereby constraining dark sector cosmology. Survey flux thresholds mask the X-Ray sky, and establish a selection effect that is highly dependent on the intrinsic scatter in the mass at fixed luminosity. A precise model for the L-M relation has emerged from constraints from the REFLEX catalog. We extend this model to include temperature variations, modeled via a log-normal covariance. We show how redshift characteristics of cluster surveys contain a strong degeneracy between intrinsic scatter and true scaling. Knowledge of the covariance behavior is therefore important in recovering true physical evolution of the cluster population. We apply a similar technique to the X-ray properties of optically selected clusters. Inter-comparison of cluster properties among samples selected on different, or multiple, observables will potentially break model degeneracies, providing clues to how properties, like X-ray luminosity, optical richness, velocity dispersion, are linked.
Many thanks to the Michigan Space Grant Consortium for their encouragement.

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