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Probing the Largest Scale Structure in the Universe with Polarization Map of Galaxy Clusters

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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Abstract

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.


Item Type:Article
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.
Group:TAPIR
Subject Keywords:cosmology; clusters of galaxies; radiofrequency cosmic radiation
Record Number:CaltechAUTHORS:SETprl05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SETprl05
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.95.101302
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2303
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:23 Mar 2006
Last Modified:26 Dec 2012 08:48

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