A Limit on the Large Angular Scale Polarization of the Cosmic Microwave Background

Details A Limit on the Large Angular Scale Polarization of the Cosmic Microwave Background A Limit on the Large Angular Scale Polarization of the Cosmic Microwave Background

2001-07-02

arxiv.org/abs/astro-ph/0107013v1

ApJ Letters: (2001), Vol 560, L1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, submitted to ApJ Letters

Scientific paper

10.1086/324222

We present an upper limit on the polarization of the Cosmic Microwave Background at 7 degree angular scales in the frequency band between 26 and 36 GHz, produced by the POLAR experiment. The campaign produced a map of linear polarization over the R.A. range 112 degrees - 275 degrees at declination 43degrees. The model-independent upper limit on the E-mode polarization component of the CMB at angular scales l = 2 - 20 is 10 microKelvin (95% confidence). The corresponding limit for the B-mode is also 10 microKelvin. Constraining the B-mode power to be zero, the 95% confidence limit on E-mode power alone is 8 microKelvin.

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