AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 46. The Sunyaev-Zel'dovich Effect: Latest Results and Future Prospects
Topical, Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southwest Exhibit Hall

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[46.02] The Sunyaev-Zel'dovich Effect Due to Distant Not-So-Massive Clusters as an Important Indicator of Cosmology

G.P. Holder, J.E. Carlstrom, J.J. Mohr (U. Chicago)

Very massive clusters are very rare and very luminous. Exactly how rare has been used to put strong constraints on cosmology. Not-so-massive clusters are not-so-rare and not-so-luminous, but their evolution as a function of redshift holds just as much cosmological information as the very rare clusters, with the added advantage of having a large number of objects to study. Upcoming SZ surveys will have the sensitivity to overcome the problem of the not-so-rare being not-so-luminous, potentially providing a large catalog of high-redshift clusters, selected in a uniform way.

We quantify this using a Press-Schechter prescription to model the redshift evolution of the number density of clusters and both N-body+gas simulations and simple models for the evolution of the intra-cluster medium. Upgrades to the existing cm-wave systems at the OVRO and BIMA arrays will provide the sensitivity to find tens of clusters per square degree for the currently fashionable cosmological model with \Omegamatter=0.3 and \Omega\Lambda=0.7. This will provide a unique catalog of high-redshift clusters, allowing detailed studies of both cosmology and evolution of the intra-cluster medium. Along the way, of course, a few of the very rare and very massive clusters will be found, allowing them to be better understood as part of a larger family.

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