Mathematics – Logic
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........58g&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, SANTA BARBARA, 1993.Source: Dissertation Abstracts International, Volume: 54-09, Sect
Mathematics
Logic
2
Low Noise Reception
Scientific paper
Anisotropy measurements of the Cosmic Background Radiation (CBR) serve as a critical test of cosmological models. Two experiments to measure CBR anisotropy are described within. Both experiments use cryogenic High Electron Mobility Transistor (HEMT) amplifiers for low noise reception. The first experiment operates at 10 ^circ angular scales at 15 and 23 GHz. The telescope was used at the South Pole in 1988-89. The data from this expedition set an upper limit to CBR fluctuations of Delta T/T<= 5.1times 10^{-5}, making it the most sensitive measurement at 4^circ in 1989. The second experiment operated at an angular scale of 1.5 ^circ with 4 channels from 25-35 GHz. The receiver was successfully used at the South Pole in 1990 -91. One 9-point scan from this expedition is discussed. The per pixel error is 15 muK for the coadded data, making it the most sensitive CBR measurement at any angular scale (per pixel) to date. Structure observed in the data is spectrally unlikely to come from CBR fluctuations. Data from the highest frequency channel are used to set upper limits to CBR fluctuations of Delta T/T<= 1.4times 10^{-5}..
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