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T. J. Pearson (Caltech), CBI Collaboration
The Cosmic Background Imager (CBI), an interferometer operating in the 26--36 GHz band, has been making observations of the polarization of the microwave background since September 2002. The EE power spectrum of the CMB has been measured at multipoles up to l ~ 1000, and upper limits have been placed on the EE power at 1000 < l < 2000. The spectrum is in good agreement with earlier measurements from DASI at lower l and with the predictions of standard \LambdaCDM models, in which the polarization is generated by Thomson scattering during recombination. The BB power spectrum is consistent with zero as expected in the standard models. The work was supported by NSF AST-0206416.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.