Mathematics – Logic
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5811m&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #58.11; Bulletin of the American Astronomical Society, Vol. 31, p.917
Mathematics
Logic
1
Scientific paper
We use an ensemble of numerical cluster simulations to examine the expected statistical and systematic uncertainties encountered when using interferometric Sunyaev-Zel'dovich (SZ) and X-ray observations to measure distances. We use clusters evolved within four cosmological models of interest, including an Omega_ {0}=0.3 model with and without Lambda_ {0} and a model with Omega =1. Cluster asphericities are common in all our models, because there is significant cluster accretion at the present epoch. We find that these realistic departures from spherical symmetry result in a ~ 20% random SZ distance uncertainty and only a small systematic. On the other hand, the gradual drop in intracluster medium temperature with distance from the cluster center introduces a systematic distance error of similar scale when clusters are analyzed using isothermal models. We estimate to what extent the Chandra and XMM X-ray telescopes will allow more sophisticated cluster analyses that will reduce systematic errors in SZ distance estimates.
Carlstrom John E.
Evrard August E.
Holder Gilbert P.
Mohr Joseph John
Reese Erik D.
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