Mathematics – Logic
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt........12r&link_type=abstract
Thesis (PhD). UNIVERSITY OF DELAWARE, Source DAI-B 61/03, p. 1450, Sep 2000, 161 pages.
Mathematics
Logic
3
Scientific paper
Results from the third campaign of a ground-based multiband observations of the millimeter emission of the sky from Tenerife (Canary Islands) are presented. The receiver consists of a 0.45 meter diameter off-axis telescope equipped with a 4-bands multi-mode He-3 photometer working at 1.1, 1.3, 2.1 and 3.1 mm wavelengths. The beam is well approximated by a Gaussian with 1°.35 degrees Full Width Half Maximum at all wavelengths. Six demodulations, or Fourier harmonies, have been obtained by using software Lock-in for each of the observing band. These harmonic are used to reconstruct differential anisotropy maps with a Fourier based technique presented in this work. Calibration of the detectors is accomplished on the field by using lunar scans. Besides the calibration factors, parameters like wobbling amplitude and pointing uncertainty of the instrument are obtained with this process. The wide wavelength coverage of our instrument allows us to characterize and reduce both the atmospheric and galactic contamination in our data. The CMB data is analyzed in 6 multipole bands from l = 39 to l = 134 and in the maps at the two longest wavelengths (2.1 and 3.1 mm). A likelihood analysis indicate that we have detection of fluctuations in all bands and at the two wavelengths. If we assume that these fluctuations are cosmological, we then have evidence of a rise in the angular power spectrum from low l to high l. Our measured spectrum is consistent with COBE and the standard Cold Dark Matter.
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