A measurement of H0 from Ryle Telescope, ASCA and ROSAT observations of Abell 773

Richard Saunders, Rüdiger Kneissl, Keith Grainge, William F. Grainger, Michael E. Jones, Alessia Maggi, Rhiju Das, Alastair C. Edge, Anthony N. Lasenby, G. G. Pooley, Shigeru J. Miyoshi, Taisuke Tsuruta, Koujun Yamashita, Yuzuru Tawara, Akihiro Furuzawa, Akihiro Harada, Izamu Hatsukade

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25 Citations (Scopus)


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 HQ of 77-15+19 km s-1 Mpc-1 (1σ errors) for an Einstein - de Sitter universe, or 85-17+20 km s-1 Mpc-1 for a flat model with ΩA = 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.

Original languageEnglish
Pages (from-to)937-940
Number of pages4
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 21-05-2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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