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Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt.......103a&link_type=abstract
ProQuest Dissertations And Theses; Thesis (Ph.D.)--University of Delaware, 2000.; Publication Number: AAT9982670; ISBN: 97805998
Other
Scientific paper
In this thesis I present the results of the Cosmic Microwave Background (CMB) anisotropy experiment carried out at the Obseravatorio del Teide (Tenerife, Spain) between May 1996 and July 1996. This dissertation is based on the data collected in the daily drift mode from May 6, 1996 to May 12, 1996, and June 8 to June 15, 1996. The telescope consists of an off-axis parabolic mirror with a focal length of 1.33 m and diameter of 45 cm coupled to an off-axis hyperbolic mirror of diameter 28 cm. The primary mirror chops in a sinusoidal manner with a reference frequency of 2 Hz, and peak-to-peak amplitude of 5°.8 on the sky. The telescope is fixed in elevation and azimuth, and the beam is centered on declination 40°. The detector system consists of 3He cooled bolometers with spectral wavelength centered at 3.3, 2.1, 1.3 and 1.1 mm. The instrument is characterized by a Full Width Half Maxima (FWHM) of ˜1°.35. Application of a robust atmospheric contamination removal technique allowed us to subtract most of the atmospheric noise from the data. We successfully show that using the shortest wavelength (1.1mm) channel as the atmospheric monitor we can greatly reduce the atmospheric contamination in the other three. Data from each channel were demodulated into six different harmonics corresponding to the six higher multiples of the reference frequency. The improved instrumental setup allows us to measure anisotropy in six different multipole ranges ℓ = 38 to ℓ = 136. In 2.1 mm channel we detect significant signals in ℓ = 38, 61, 81 and 100 and upper limits in ℓ = 119 and 136. In channel 1 (3.1 mm) we detect only upper limits. The detected signal is consistent with our 1994 result and the results of other CMB experiments probing the same ℓ range.
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