AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 58. The Sunyaev-Zel'dovich Effect: Latest Results and Future Prospects
Topical, Oral, Tuesday, June 1, 1999, 2:30-4:00pm, 4:15-6:00pm, Continental Ballroom B

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[58.06] Distance Estimates for High Redshift Clusters from SZ and X-ray Measurements

M. Joy (NASA/MSFC), J.E. Carlstrom, E.D. Reese, G.P. Holder, J. Mohr (U. Chicago), S.K. Patel (U. Ala. Huntsville), L. Grego (SAO), W.L. Holzapfel (UC Berkeley), M. Donahue (STScI), J.P. Hughes (Rutgers), D. Neumann (Saclay)

We present interferometric images of the Sunyaev-Zel'dovich effect for the high redshift (z > 0.5) galaxy clusters in the \emph{Einstein} Medium Sensitivity Survey: MS0451.5-0305 (z=0.54), MS0015.9+1609 (z=0.55), MS2053.7-0449 (z=0.58), MS1137.5+6625 (z=0.78), and MS 1054.5-0321 (z=0.83). Isothermal \beta models are applied to the data to determine the magnitude of the Sunyaev-Zel'dovich decrement in each cluster. Complementary ROSAT PSPC and HRI x-ray data are also analyzed, and are combined with the S-Z data to generate an independent estimate of the cluster distance.

Since the Sunyaev-Zel'dovich Effect is invariant with redshift, sensitive S-Z imaging can provide an independent determination of the size, shape, density, and distance of high redshift galaxy clusters; we will discuss current systematic uncertainties with this approach, as well as future observations which will yield stronger constraints.

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