Observations of the Sunyaev-Zel'dovich effect in the z=0.78 cluster MS 1137.5+6625

Astronomy and Astrophysics – Astronomy

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Galaxies: Clusters: Individual: Ms 1137.5+6625, Cosmology: Observations

Scientific paper

We have observed the z=0.78 cluster MS 1137.5+6625 with the Ryle Telescope (RT) at 15GHz. After subtraction of contaminating radio sources in the field, we find a Sunyaev-Zel'dovich flux decrement of -421+/-60μJy on the ~0.65kλ baseline of the RT, spatially coincident with the optical and X-ray positions for the cluster core. For a spherical King-profile cluster model, the best fit to our flux measurement has a core radius θC=20arcsec, consistent with previous X-ray observations, and a central temperature decrement ΔT=650+/-92μK. Using this model, we calculate that the cluster has a gas mass inside a 500\,h-165\,kpc radius of 2.9×1013Msolar for an ΩM=1 universe and 1.6×1013Msolar for ΩM=0.3, ΩΛ=0.7. We compare this model with existing measurements of the total mass of the cluster, based on gravitational lensing, and estimate a gas fraction for MS 1137.5+6625 of ~8 per cent.

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