Mathematics – Logic
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phdt.........3j&link_type=abstract
Thesis (PhD). UNIVERSITY OF HAWAII, Source DAI-B 62/02, p. 897, Aug 2001, 205 pages.
Mathematics
Logic
Scientific paper
The density and nature of high-redshift galaxies are important observational constraints of cosmological models and cluster formation. Three newer methods of searching for high redshift galaxies have been refined in this research: improving the seeing quality and sensitivity of existing telescopes through tip-tilt imaging, creating new infrared image processing algorithms to increase the low-level sensitivity of imagery, and using the natural magnification of gravitational lenses to find fainter objects than could otherwise be observed. The tip-tilt system installed on the University of Hawaii 88-inch telescope has produced some of the best tip-tilt images taken at any telescope; tip-tilt increases resolution typically by a factor of two and sensitivity by as much as 1.5 magnitudes. By using x-ray luminosity to select the galaxy clusters, high-mass clusters with greater gravitational lensing cross-sections and amplification were observed. Deep infrared imaging, combined with optical imaging, allows the selection of extremely red objects (ERO's). These ERO's were found at a surface density of 2.0+0.4-0.3 per arcminute2 compared with a background surface density of 0.17+0.04- 0.04 per arcminute2. The ERO's are probably high-redshift galaxies. Deep infrared imaging of cluster gravitational lenses has now been proven as an efficient method of finding previously unknown candidate high-redshift galaxies in a uniformly- selected manner. This catalog will serve as the basis for future research into new constraints on ΩM, H0, q0, star formation in the early universe, and perhaps cluster formation as well.
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