AAS 205th Meeting, 9-13 January 2005
Session 73 Distances, the CMB and the Sunyaev-Zeldovich Effect
Oral, Tuesday, January 11, 2005, 10:00-11:30am, Golden Ballroom

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[73.06] CMB polarization observations with the Cosmic Background Imager

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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