Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........35a&link_type=abstract
PhD Dissertation, Stanford Univ. CA United States
Other
11
Vibration Isolators, Radiation Detectors, Gravitational Waves, Quasars, Line Spectra, Absorption Spectra, Stellar Spectra, Very Large Array (Vla), Radio Emission, Red Shift, Radio Spectra, Interstellar Matter
Scientific paper
In Part 1 of the thesis we discuss passive vibration isolation systems for ultralow temperature gravitational radiation detectors, using the detector at Stanford University as the primary example. The basic theory of such isolation systems is reviewed and we describe methods of analysis for one-degree-of-freedom isolators. Next we discuss general design considerations, optimization and detailed analysis of six degree-of-freedom isolators. We conclude with experimental data from isolators designed for the Stanford gravitational radiation detector. Part 2 of the thesis is concerned with the study of quasi-stellar object (QSO) absorption lines. In Chapter 2 we give a comprehensive review of the empirical properties of QSO absorption line systems. We also give the basic foundations in cosmology, radiative transfer, and properties of the Milky Way interstellar medium which are necessary for understanding the absorption line results. In Chapter 3 we present a sample of quasars which are lobe dominated in their radio emission and contain Mg II absorption line systems. This sample will be useful in a search for redshifted 21 cm H I absorbers which are along lines of sight different from the optical. These systems will allow the measurement of the linear size and related physical parameters of the absorption line clouds. In this chapter we give an analysis of our selection criteria for defining the sample, and present new VLA (Very Large Array) observations of 16 quasars. We also give a detailed overview of practical issues associated with observing 21 cm H I at high-redshift and describe our forthcoming observations at the NRA0 140 foot telescope in November, 1993. In Chapter 4 we carry out an analysis of the statistical properties of Mg II absorbers found in a sample of 56 quasars. The details of the observations are given and we present all of the spectra which were obtained. We give details of the statistical analysis in which the number density distribution as a function of redshift and equivalent width is calculated. We determine values of a number of model parameters for our sample alone and our sample combined with other surveys, and find they are consistent with previously published results.
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