Volume 518, July-August 2010
Herschel: the first science highlights
|Number of page(s)||5|
|Published online||16 July 2010|
Letter to the Editor
First detection of the Sunyaev Zel'dovich effect increment at λ < 650 μm *
California Institute of Technology, Pasadena, CA 91125,
USA e-mail: firstname.lastname@example.org
2 Jet Propulsion Laboratory, Pasadena, CA 91109, USA
3 Steward Observatory, University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721, USA
4 Herschel Science Centre, ESAC, ESA, PO Box 78, Villanueva de la Cañada, 28691 Madrid, Spain
5 Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 Av. Edouard Belin, 31400 Toulouse, France
6 Observatoire de Paris, LERMA, 61 Av. de l'Observatoire, 75014 Paris, France
7 Laboratoire d'Astrophysique de Marseille, CNRS – Université Aix-Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
8 Geneva Observatory, University of Geneva, 51, Ch. des Maillettes, 1290 Versoix, Switzerland
9 NASA Herschel Science Center, California Institute of Technology, MS 100-22, Pasadena, CA 91125, USA
10 UK Astronomy Technology Centre, Science and Technology Facilities Council, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
11 Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK
12 Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany
13 Departamento de Astrofísica, Facultad de CC. Físicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
14 Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
15 Department of Astronomy, University of Padova, Vicolo dell'Osservatorio 3, 35122 Padova, Italy
16 School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
17 Sterrewacht Leiden, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
Accepted: 10 May 2010
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 > 1.3 mm, an increment at shorter wavelengths, and small again by λ ~ 250 μm. 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 μm and have detected the SZ effect at the two longest wavelengths. The measured SZ effect increment central intensities are ΔI0 = 0.097 ± 0.019 MJy sr-1 at 350 μm and ΔI0 = 0.268 ± 0.031 MJy sr-1 at 500 μm, 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 2.1σ, 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.
Key words: cosmic background radiation / galaxies: clusters: individual: 1E0657-56
Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. It is open for proposals for observing time from the worldwide astronomical community. Data presented in this paper were analyzed using “The Herschel interactive processing environment (HIPE)”, a joint development by the Herschel Science Ground Segment Consortium, consisting of ESA, the NASA Herschel Science Center, and the HIFI, PACS and SPIRE consortia.
© ESO, 2010
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