1999/04/30 by Richard Saunders, R. Kneißl, Ruediger Kneissl +24 · 3 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2003.06467.x
published as Mon.Not.Roy.Astron.Soc. 341 (2003) 937 · 5 pages, 6 figures, MNRAS in press (minor revisions)
arxiv created 2003/03/10 · openalex publication_date 2003/05/12 · arxiv updated 2009/12/01 · openalex created_date 2020/11/23 · openalex updated_date 2026/07/28
We present new Ryle Telescope (RT) observations of the Sunyaev–Zel'dovich (SZ) decrement from the cluster Abell 773. The field contains a number of faint radio sources that required careful subtraction. We use ASCA observations to measure the gas temperature and a ROSAT HRI image to model the gas density distribution. Normalizing the gas distribution to fit the RT visibilities returns a value of H0 of 77+19−15 km s−1 Mpc−1 (1σ errors) for an Einstein–de Sitter universe, or 85+20−17 km s−1 Mpc−1 for a flat model with ΩΛ= 0.7. The errors quoted include estimates of the effects of the principal errors: noise in the SZ measurement, gas temperature uncertainty and line-of-sight depth uncertainty.