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S. S. Giandoni (New Mexico State University/University of Wyoming), H. A. Kobulnicky (University of Wyoming), J. Prochaska (University of California, Santa cruz), S. Hwang, D. C. Kiminki (University of Wyoming)
The study of quasars and the systems around them is one method of exploring how galaxies are formed and the overall large-scale structure of matter in the universe. Ultraviolet Hubble Space Telescope spectra taken toward the z=0.223 quasar PKS0312-770 have revealed intergalactic absorption lines at redshifts of z=0.2028, z=0.1983, z=1589, and z=0.1575. The purpose of this research was to measure the redshifts of a large number of galaxies in the sightline towards this quasar to search for clusters or groups of galaxies which are responsible for producing absorption lines at these specific redshifts. Redshifts were measured using data from 132 spectra that were taken with the Wide Field Reimaging CCD Camera on the 2.5 m Irènèe du Pont telescope at Las Campanas Observatory on October 30 through November 3, 2002. We detect an excess of galaxies at redshifts of z=0.15, z=0.19, and z=0.20 which may be responsible for the absorption line systems seen in the HST data and we identify probable galaxies associated with these intervening absorbers. We also identify an excess of galaxies near z=0.05 which may indicate a nearby cluster of galaxies which does not produce an absorption signature in the quasar's spectrum.
The author(s) of this abstract have provided an email address for comments about the abstract: giandoni@nmsu.edu
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.