A measurement of H_0 from Ryle Telescope, ASCA and ROSAT observations of Abell 773

Details A measurement of H_0 from Ryle Telescope, ASCA and ROSAT observations of Abell 773 A measurement of H_0 from Ryle Telescope, ASCA and ROSAT observations of Abell 773

1999-04-13

arxiv.org/abs/astro-ph/9904168v3

Mon.Not.Roy.Astron.Soc. 341 (2003) 937

Astronomy and Astrophysics

Astrophysics

5 pages, 6 figures, MNRAS in press (minor revisions)

Scientific paper

10.1046/j.1365-8711.2003.06467.x

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 distribution. Normalising the gas distribution to fit the RT visibilities returns a value of H_0 of 77 (+19,-15) km/s/Mpc (1-sigma errors) for an Einstein-de-Sitter universe, or 85 (+20,-17) km/s/Mpc for a flat model with Omega_Lambda = 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.

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