Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21111905s&link_type=abstract
American Astronomical Society, AAS Meeting #211, #119.05; Bulletin of the American Astronomical Society, Vol. 39, p.948
Other
Scientific paper
Current and near-future galaxy cluster surveys at a variety of wavelengths may provide a promising way to obtain precision measurements of structure growth over cosmic time. This in turn would serve as an important precision probe of cosmology. However, to realize the full potential of these surveys, systematic uncertainties in cluster mass estimates and sample selection must be well understood. This work follows two different approaches to understand these uncertainties.
X-ray and weak-lensing mass estimates are compared for shear-selected galaxy clusters in the Deep Lens Survey (DLS) to study possible biases in using cluster baryons or weak-lensing shear as tracers of the cluster dark matter. The weak-lensing observations are from the Kitt Peak Mayall 4-m telescope, and the X-ray observations are from both Chandra and XMM-Newton. Results are presented for four galaxy clusters that comprise the top-ranked shear-selected system in the DLS, and for three of these clusters there is agreement between X-ray and weak-lensing mass estimates. For the fourth cluster, the X-ray mass estimate is higher than that from weak-lensing by 2 sigma, and X-ray images suggest this cluster may be undergoing a merger with a smaller cluster. This merger may be biasing the X-ray mass estimate high. Analysis of a larger cluster sample is in progress.
Cluster sample selection is investigated in the context of arcminute-resolution millimeter-wavelength surveys such as the Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT). Large-area, realistic simulations of the microwave sky are constructed and cluster detection is simulated using a multi-frequency Wiener filter to separate the galaxy clusters, via their Sunyaev-Zel'dovich signal, from other contaminating microwave signals. Using this technique, an ACT-like survey can expect to obtain a cluster sample that is 90% complete and 85% pure above 3x1014 Msun. Extension of these simulations to optical and X-ray surveys is ongoing.
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