First Detection of the Sunyaev Zel'Dovich Effect Increment At λ <650 μm

M Zemcov, M Rex, TD Rawle, JJ Bock, E Egami, B Altieri, AW Blain, Graham Smith

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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 lambda > 1.3 mm, an increment at shorter wavelengths, and small again by lambda similar to 250 mu m. 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 500 mu m and have detected the SZ effect at the two longest wavelengths. The measured SZ effect increment central intensities are Delta I-0 = 0.097 +/- 0.019 MJy sr(-1) at 350 mu m and Delta I-0 = 0.268 +/- 0.031 MJy sr(-1) at 500 mu m, consistent with the SZ effect spectrum derived from previous measurements at 2 mm. 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 2.1 sigma, 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.
Original languageEnglish
Pages (from-to)L16-
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Jul 2010


  • galaxies: clusters: individual: 1E0657-56
  • cosmic background radiation


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