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Cosmic Microwave Background Radiation Anisotropy and Polarization from Dome-C - Antarctica

Cosmic Microwave Background Radiation Anisotropy and Polarization from Dome-C - Antarctica. L. Piccirillo a , G. Dall’Oglio b , P. Timbie c Bartol Research Institute Universita’ di Roma III University of Wisconsin.

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Cosmic Microwave Background Radiation Anisotropy and Polarization from Dome-C - Antarctica

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  1. Cosmic Microwave Background Radiation Anisotropy and Polarization from Dome-C - Antarctica • L. Piccirilloa, G. Dall’Ogliob, P. Timbiec • Bartol Research Institute • Universita’ di Roma III • University of Wisconsin The plot shows a comparison among three exceptional observing sites: South-Pole, Atacama Desert and Dome-C. Typical PWV summer values at Dome-C are 0.5 mm Observational Cosmology at mm and sub-mm wavelengths is severely constrained by atmospheric transmission and turbulence. Antarctica appears to have the best observing conditions in the world. The Dome-C French-Italian base is located on the Antarctic Plateau at Latitude 75.0 and Longitude 123.30 . Since 1997, the NSF Polar Program is sponsoring a program of observational cosmology at Dome-C On-axis 1.5m diameter Cassegrain Telescope 2-D chopping mirror 1998/99 US-Italian Antarctic expedition. Site testing experiment performed at Dome-C from January 10th to January 20th. The horizontal looking Cassegrain telescope defines a 10 arcmin beam in the sky. The 2-D chopping mirror is operated with two electrical actuators and allows the beam to perform complex observing strategy. We allowed the beam to perform elliptical paths with variable angular dimension to probe the sky noise at different angular scales. The photometer is an 3He bolometric system operating at 3.1, 2.1, 1.4 and 1.1 mm wavelength. The intrinsic detector noise ranges from 0.8 to 6 mK/sqrt(Hz). One of the authors (LP) during the measurements campaign at Dome-C. The OASI telescope (2.6 meter diameter Cassegrain) deployed at Baia Terra Nova – Antarctica. A copy of this telescope, called COMPASS/SSPEX is being built by the US-Italian collaboration and will be installed at Dome-C in 2002. Sky noise measurements results from the 1998/99 Dome-C campaign. The left panel shows the typical noise of a cloudy day. The right panel shows a good observing day. The good observing day is detector noise limited at all wavelengths.

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