Mathematics – Logic
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phdt.........5k&link_type=abstract
Ph.D. Thesis California Inst. of Tech., Pasadena.
Mathematics
Logic
6
Elliptical Galaxies, Emission Spectra, Galactic Clusters, Galactic Evolution, Interacting Galaxies, Spiral Galaxies, Interstellar Gas, X Ray Sources
Scientific paper
The influence of a hot medium on the formation and evolution of galaxies in rich clusters is investigated. The two peculiar systems of emission line filaments around the galaxy NGC1275 in the Perseus cluster are studied. It is concluded that one system consists of condensations in an accretion flow from a surrounding medium onto an underlying elliptical galaxy while the second system arises in a superposed but unrelated spiral galaxy. The formation of SO galaxies by the ram pressure sweeping of spirals due to their motion through a hot intracluster medium is investigated and found to be too weak by a large factor to produce the required numbers of SO's. Observations of emission lines from spiral galaxies in the X-ray cluster Al367 reveal a deficiency in gas content relative to field galaxies, and is strongest for galaxies closest to the region of X-ray emission. The systematic trends in morphological populations observed in clusters are explained as resulting from a truncation of disks in spirals and SO during their formation due to cluster collapse.
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