Gas flow in the disk of the galaxy NGC 4258. I - A first two-dimensional model

Details Gas flow in the disk of the galaxy NGC 4258. I - A first two-dimensional model Gas flow in the disk of the galaxy NGC 4258. I - A first two-dimensional model

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....74...42i&link_type=abstract

Astronomy and Astrophysics, vol. 74, no. 1, Apr. 1979, p. 42-53.

Astronomy and Astrophysics

Astrophysics

11

Galactic Evolution, Galactic Nuclei, Gas Flow, Two Dimensional Models, Astronomical Models, Equations Of Motion, Rarefaction, Shock Waves, Spiral Galaxies

Scientific paper

The consequences of an explosion in a galactic nucleus are studied by numerically solving the equations of motion of gas in the perturbed galaxy. It is assumed that during the explosion, gas is expelled from the nucleus in two opposite directions. The ensuing flow in the galaxy's disk shows, as expected, the presence of rarefaction and shock waves, strong noncircular motions, and transient spiral arms. Within two or three galactic years, differential rotation obliterates these structures almost entirely. Comparison is made between some of these models and the galaxies NGC 4258 and NGC 3310.

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