SIMBAD references

The Sunyaev-Zel'dovich (SZ) effect is a spectral distortion of the cosmic microwave background as observed through the hot plasma in galaxy clusters. This distortion is a decrement in the CMB intensity for λ>1.3mm, an increment at shorter wavelengths, and small again by λ∼250µm. As part of the Herschel Lensing Survey (HLS) we have mapped 1E0657-56 (the Bullet cluster) with SPIRE with bands centered at 250, 350 and 500µm and have detected the SZ effect at the two longest wavelengths. The measured SZ effect increment central intensities are ΔI₀=0.097±0.019MJy/sr at 350µm and ΔI₀=0.268±0.031MJy/sr at 500µm, consistent with the SZ effect spectrum derived from previous measurements at 2mm. No other diffuse emission is detected. The presence of the finite temperature SZ effect correction is preferred by the SPIRE data at a significance of 2.1σ, opening the possibility that the relativistic SZ effect correction can be constrained by SPIRE in a sample of clusters. The results presented here have important ramifications for both sub-mm measurements of galaxy clusters and blank field surveys with SPIRE.