Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-03
2000 ApJ 533 38
Astronomy and Astrophysics
Astrophysics
14 pages, 4 figures, uses emulateapj.sty; corrected eqn 4 and minor text changes
Scientific paper
10.1086/308662
We determine the distances to the z~0.55 galaxy clusters MS 0451.6-0305 and CL 0016+16 from a maximum likelihood joint fit to interferometric Sunyaev-Zel'dovich effect (SZE) and X-ray observations. We model the intracluster medium (ICM) using a spherical isothermal beta-model. We quantify the statistical and systematic uncertainties inherent to these direct distance measurements, and we determine constraints on the Hubble parameter for three different cosmologies. For an OmegaM = 0.3, OmegaL = 0.7 cosmology, these distances imply a Hubble constant of 63 ^{+12}_{- 9} ^{+21}_{-21} km/s/Mpc, where the uncertainties correspond to statistical followed by systematic at 68% confidence. The best fit Ho is 57 km/sec/Mpc for an open OmegaM = 0.3 universe and 52 km/s/Mpc for a flat Omega = 1 universe.
Carlstrom John E.
Donahue Megan
Grego Laura
Holder Gilbert P.
Holzapfel William L.
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