Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944101n&link_type=abstract
American Astronomical Society, AAS Meeting #219, #441.01
Astronomy and Astrophysics
Astrophysics
Scientific paper
Galaxy cluster masses are of interest for many areas of astrophysics and cosmology. Multi-wavelength observations of clusters are now underway to better constrain masses both for individual clusters and ensembles of clusters. However, many of these cluster mass measurements have been found to have correlated scatter, which can lead to measurement errors and/or bias if not accounted for. We consider mock observational mass measurements of galaxy clusters in a high resolution N-body simulation to better understand how scatters of different mass measurements are related to each other and how physical and observational properties of galaxy clusters are connected to these scatters. By observing each cluster from 96 different directions, we find the range of scatters for each observational method and use principal component analysis (PCA) to identify the combinations of mass measurements which maximize and minimize these mass scatters. We then find the correlation of these scatters with the physical cluster or environmental properties. We also consider the ensemble of clusters, and discuss outliers and what physical and observational properties might distinguish them.
Cohn Joanne D.
Noh Yookyung
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