Other
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983s%26t....66..206k&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 66, Sept. 1983, p. 206-210.
Other
2
Astronomical Spectroscopy, Galactic Nuclei, Interstellar Gas, Radio Galaxies, Seyfert Galaxies, Active Galactic Nuclei, Galactic Evolution, Galactic Structure, H Alpha Line, Nitrogen Ions, Radio Spectra, Supernovae, Visible Spectrum
Scientific paper
Observational data on interstellar gas clouds that have a bearing on history of the galactic regions containing the gas are explored. The comparison of conditions of gas clouds around active galactic nuclei, such as Seyfert and radio galaxies, has shown that accreted gas in galactic centers can lead to supernovae which superheat the gas and remove the gravitational bounds to its expansion into intergalactic space. Matter near the center of the galaxy, however, may become trapped and form an active nucleus. Optical slit spectroscopy and radio observations are used to study active nuclei in terms of H-alpha or ionized nitrogen lines. Although the galaxies are normally spirals, other gas formations may include filaments indicating violent activity, and jets of gas that interact with surrounding low density gas and display emission lines.
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