| Title | Determining the Cosmic Distance Scale from Interferometric Measurements of the Sunyaev-Zeldovich Effect |
| Authors | Reese, Erik D.; Carlstrom, John E.; Joy, Marshall; Mohr, Joseph J.; Grego, Laura; Holzapfel, William L. |
| Bibcode | 2002ApJ...581...53R Search ADS ↗ |
| Abstract | We determine the distances to 18 galaxy clusters with redshifts ranging from z~0.14 to 0.78 from a maximum likelihood joint analysis of 30 GHz interferometric Sunyaev-Zeldovich effect (SZE) and X-ray observations. We model the intracluster medium (ICM) using a spherical isothermal β 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. These distances imply a Hubble constant of 60+4+13-4-18 km s-1 Mpc-1 for an ΩM=0.3, ΩΛ=0.7 cosmology, where the uncertainties correspond to statistical followed by systematic at 68% confidence. With a sample of 18 clusters, systematic uncertainties clearly dominate. The systematics are observationally approachable and will be addressed in the coming years through the current generation of X-ray satellites (Chandra and XMM-Newton) and radio observatories (Owens Valley Radio Observatory, Berkeley-Illinois-Maryland Association, and Very Large Array). Analysis of high-redshift clusters detected in future SZE and X-ray surveys will allow a determination of the geometry of the universe from SZE-determined distances. |
| Objects | 18 Objects Search NED ↙ |
