First detection of the Sunyaev Zel'dovich effect increment at lambda < 650 um
Abstract
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 ~250 um. 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 um 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 um and Delta I_{0} = 0.268 +- 0.031 MJy sr^{-1} at 500 um, 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.
Cite
@article{arxiv.1005.3824,
title = {First detection of the Sunyaev Zel'dovich effect increment at lambda < 650 um},
author = {M. Zemcov and M. Rex and T. D. Rawle and J. J. Bock and E. Egami and B. Altieri and A. W. Blain and F. Boone and C. R. Bridge and B. Clement and F. Combes and C. D. Dowell and M. Dessauges-Zavadsky and D. Fadda and O. Ilbert and R. J. Ivison and M. Jauzac and J. -P. Kneib and D. Lutz and R. Pelló and M. J. Pereira and P. G. Pérez-González and J. Richard and G. H. Rieke and G. Rodighiero and D. Schaerer and G. P. Smith and I. Valtchanov and G. L. Walth and P. van der Werf and M. W. Werner},
journal= {arXiv preprint arXiv:1005.3824},
year = {2015}
}
Comments
Accepted for publication in Astronomy and Astrophysics (Herschel special issue)