We report the first detection of a Sunyaev-Zel'dovich (S-Z) decrement using the Arcminute Microkelvin Imager (AMI). We have made commissioning observations towards the cluster of galaxies A1914 and detected the S-Z effect with a significance of 17σ in a uυ-tapered map at a mean frequency of 15.75 GHz. The integrated S-Z flux density of -8.6 ± 0.5 mJy is consistent with a simple X-ray derived model for the intracluster gas. We find that the spectrum of the decrement, measured in the six channels between 13.5-18 GHz, fits well to that expected for the S-Z effect. The sensitivity of the telescope is consistent with the figures used in our simulations of cluster surveys with AMI.
|Number of pages||4|
|Journal||Monthly Notices of the Royal Astronomical Society: Letters|
|Publication status||Published - 1 Jun 2006|
- Cosmic microwave background
- Galaxies: clusters: individual: A1914