The White Mountain Polarimeter Telescope and an Upper Limit on CMB Polarization

Details The White Mountain Polarimeter Telescope and an Upper Limit on CMB Polarization The White Mountain Polarimeter Telescope and an Upper Limit on CMB Polarization

2008-04-23

arxiv.org/abs/0804.3634v1

Astronomy and Astrophysics

Astrophysics

35 pages. 12 figures. To appear in ApJS

Scientific paper

10.1086/588784

The White Mountain Polarimeter (WMPol) is a dedicated ground-based microwave telescope and receiver system for observing polarization of the Cosmic Microwave Background. WMPol is located at an altitude of 3880 meters on a plateau in the White Mountains of Eastern California, USA, at the Barcroft Facility of the University of California White Mountain Research Station. Presented here is a description of the instrument and the data collected during April through October 2004. We set an upper limit on $E$-mode polarization of 14 $\mu\mathrm{K}$ (95% confidence limit) in the multipole range $170<\ell<240$. This result was obtained with 422 hours of observations of a 3 $\mathrm{deg}^2$ sky area about the North Celestial Pole, using a 42 GHz polarimeter. This upper limit is consistent with $EE$ polarization predicted from a standard $\Lambda$-CDM concordance model.

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