Seto, Naoki and Pierpaoli, Elena (2005) Probing the Largest Scale Structure in the Universe with Polarization Map of Galaxy Clusters. Physical Review Letters, 95 (10). Art. No. 101302. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:SETprl05
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We introduce a new formalism to describe the polarization signal of galaxy clusters on the whole sky. We show that a sparsely sampled, half-sky map of the cluster polarization at z~1 would allow us to better characterize the very large scale density fluctuations. While the horizon length is smaller in the past, two other competing effects significantly remove the contribution of the small scale fluctuations from the quadrupole polarization pattern at z~1. For the standard LambdaCDM universe with vanishing tensor mode, the quadrupole moment of the temperature anisotropy at z=0 is expected to have a ~32% contribution from fluctuations on scales below 6.3 h^-1 Gpc. This percentage would be reduced to ~2% level for the quadrupole moment of polarization pattern at z~1. A cluster polarization would shed light on the potentially anomalous features of the largest scale fluctuations.
|Additional Information:||©2005 The American Physical Society (Received 27 February 2005; published 2 September 2005) The authors would like to thank A. Cooray and M. Sasaki for discussions. N. S. is supported by NASA Grant No. NNG04GK98G and the Japan Society for the Promotion of Science. E. P. is supported by NSF Grant No. AST-0340648 and NASA Grant No. NAG5-11489.|
|Subject Keywords:||cosmology; clusters of galaxies; radiofrequency cosmic radiation|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||23 Mar 2006|
|Last Modified:||26 Dec 2012 08:48|
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