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

  1. Richard Saunders1,*,
  2. Rüdiger Kneissl1,
  3. Keith Grainge1,
  4. William F. Grainger1,
  5. Michael E. Jones1,
  6. Alessia Maggi2,
  7. Rhiju Das1,*,
  8. Alastair C. Edge3,
  9. Anthony N. Lasenby1,
  10. G. G. Pooley1,
  11. Shigeru J. Miyoshi4,
  12. Taisuke Tsuruta4,
  13. Koujun Yamashita5,
  14. Yuzuru Tawara5,
  15. Akihiro Furuzawa5,
  16. Akihiro Harada5,
  17. Izamu Hatsukade6

Article first published online: 11 MAY 2003

DOI: 10.1046/j.1365-8711.2003.06467.x

Issue

Monthly Notices of the Royal Astronomical Society

Monthly Notices of the Royal Astronomical Society

Volume 341, Issue 3, pages 937–940, May 2003

Additional Information

How to Cite

Saunders, R., Kneissl, R., Grainge, K., Grainger, W. F., Jones, M. E., Maggi, A., Das, R., Edge, A. C., Lasenby, A. N., Pooley, G. G., Miyoshi, S. J., Tsuruta, T., Yamashita, K., Tawara, Y., Furuzawa, A., Harada, A. and Hatsukade, I. (2003), A measurement of H0 from Ryle Telescope, ASCA and ROSAT observations of Abell 773. Monthly Notices of the Royal Astronomical Society, 341: 937–940. doi: 10.1046/j.1365-8711.2003.06467.x

Author Information

  1. 1

    Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE

  2. 2

    St John's College, Cambridge CB2 1TP

  3. 3

    Department of Physics, South Road, Durham DH1 3LE

  4. 4

    Department of Physics, Kyoto Sangyo University, Kamigamo-Motoyama, Kito-ku, Kyoto 603, Japan

  5. 5

    Department of Astrophysics, Faculty of Science, Nagoya University, Chikusa-ku, Nagoya 464-01, Japan

  6. 6

    Faculty of Engineering, Miyazaki University, 1-1 Gakuen-kibanadai-nishi, Miyazaki 889-21, Japan

* E-mail: kjbg1@mrao.cam.ac.uk
Present address: Physics Department, Stanford University, CA 94305-4060, USA.

Publication History

  1. Issue published online: 11 MAY 2003
  2. Article first published online: 11 MAY 2003
  3. Accepted 2003 January 28. Received 2003 January 17; in original form 2001 March 20

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Keywords:

  • galaxies: clusters: individual: A773;
  • cosmic microwave background;
  • cosmology: observations;
  • distance scale;
  • X-rays: general

ABSTRACT

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.

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