Cooray, Asantha and Baumann, Daniel (2003) CMB polarization towards clusters as a probe of the integrated Sachs-Wolfe effect. Physical Review D, 67 (6). Art. No. 063505. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:COOprd03
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The scattering of the temperature anisotropy quadrupole by free electrons in galaxy clusters leads to a now well-known polarization signal in the cosmic microwave background fluctuations. Using multifrequency polarization data, one can extract the temperature quadrupole and separate it from the contaminant polarization associated with the kinematic quadrupole due to the transverse motion of clusters. At low redshifts, the temperature quadrupole contains a significant contribution from the integrated Sachs-Wolfe effect (ISW) associated with the growth of density fluctuations. Using polarization data from a sample of clusters over a wide range in redshift, one can statistically establish the presence of the ISW effect and determine the redshift dependence of the ISW contribution to the rms quadrupole. Given the strong dependence of the ISW effect on the background cosmology, the cluster polarization can eventually be used as a probe of the dark energy.
|Additional Information:||©2003 The American Physical Society. Received 26 October 2002; published 17 March 2003. We thank A. Challinor and I. Maor for useful comments on our paper. This work was supported in part by DOE DEFG03-92-ER40701, the Sherman Fairchild Foundation (A.C.), and Caltech (D.B.). A.C. thanks the Kavli Institute for Theoretical Physics (supported by NSF PHY99-07949) for hospitality while this work was completed. D.B. thanks the Astrophysics Group of the Cavendish Laboratory where parts of this work were carried out.|
|Subject Keywords:||radiofrequency cosmic radiation; clusters of galaxies; fluctuations; dark energy; electromagnetic wave polarisation; red shift; cosmology|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||27 Oct 2006|
|Last Modified:||26 Dec 2012 09:14|
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