Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..57..401h&link_type=abstract
Astrophysics and Space Science, vol. 57, no. 2, Aug. 1978, p. 401-408.
Astronomy and Astrophysics
Astrophysics
2
Galactic Evolution, Galactic Nuclei, Galactic Rotation, Galactic Structure, Spiral Galaxies, Astrophysics, Explosions, Mass Distribution
Scientific paper
A model for the mass distribution in a galaxy which yields a rotation curve of the normal shape is used to calculate spiral-arm formation due to a central explosion in a nucleus surrounded by a gas disk of nonnegligible mass. It is assumed that the amount of gas ejected is of the order of a few percent of the nucleus and that gas blobs ejected from the center emerge at a distance of 1200 pc with a velocity directed along the galactic plane. The spiral arms resulting from four different explosions are obtained, and it is found that an explosion in which all the gas is ejected with almost the same velocity may give rise to exceptionally stable galactic forms. Spiral-arm lifetimes of at least 500 million years are estimated. It is suggested that the energy input in gas motion could be of the order of 10 to the 43rd erg/s for a total kinetic energy of approximately 5 x 10 to the 57th erg and an explosion duration of the order of 10 million years.
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