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First detection of the Sunyaev Zel'dovich effect increment at λ < 650 μm

Zemcov, M. and Bock, J. J. and Blain, A. W. and Bridge, C. R. and Dowell, C. D. and Fadda, D. (2010) First detection of the Sunyaev Zel'dovich effect increment at λ < 650 μm. Astronomy and Astrophysics, 518 . Art. No. L16. ISSN 0004-6361.

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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 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 ΔI_0 = 0.097 ± 0.019 MJy sr^(-1) at 350 μm and ΔI_0 = 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.

Item Type:Article
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URLURL TypeDescription
Zemcov, M.0000-0001-8253-1451
Bock, J. J.0000-0002-5710-5212
Blain, A. W.0000-0001-7489-5167
Fadda, D.0000-0002-3698-7076
Additional Information:© 2010 ESO. Received 31 March 2010; Accepted 10 May 2010. Published online 16 July 2010. 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. This work is based in part on observations made with Herschel, a European Space Agency Cornerstone Mission with significant participation by NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.
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Subject Keywords:cosmic background radiation; galaxies: clusters: individual: 1E0657−56
Record Number:CaltechAUTHORS:20101115-102053323
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Official Citation:First detection of the Sunyaev Zel'dovich effect increment at λ < 650 μm M. Zemcov, M. Rex, T. D. Rawle, J. J. Bock, E. Egami, B. Altieri, A. W. Blain, F. Boone, C. R. Bridge, B. Clement, F. Combes, C. D. Dowell, M. Dessauges-Zavadsky, D. Fadda, O. Ilbert, R. J. Ivison, M. Jauzac, J.-P. Kneib, D. Lutz, R. Pelló, M. J. Pereira, P. G. Pérez-González, J. Richard, G. H. Rieke, G. Rodighiero, D. Schaerer, G. P. Smith, I. Valtchanov, G. L. Walth, P. van der Werf and M. W. Werner A&A 518 L16 (2010) DOI: 10.1051/0004-6361/201014685
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20801
Deposited By: Jason Perez
Deposited On:15 Nov 2010 22:20
Last Modified:09 Mar 2020 13:18

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