On the formation of spiral and ring-shaped features around galactic nuclei

Details On the formation of spiral and ring-shaped features around galactic nuclei On the formation of spiral and ring-shaped features around galactic nuclei

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1734p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 5, p. 1734-1742

Astronomy and Astrophysics

Astronomy

1

Accretion Disks, Galactic Evolution, Galactic Mass, Galactic Nuclei, Interstellar Gas, Ring Galaxies, Spiral Galaxies, Astronomical Models, Charge Coupled Devices, Ejecta, Velocity Distribution

Scientific paper

This work is an improvement upon an earlier study about the formation of spiral features in galactic nuclei, starting again from an ejection mechanism (Pismis & Moreno, (1984)) We now consider a semi-ballistic treatment to follow the motion of a mass element ejected from a nuclear region, and find the locus at a given time, and its associated velocity field, on which the ejected elements are distributed. Given enough time, the interaction of the ejecta with the gas in the galactic disk drives a spiral feature into a ring. After considering some properties emerging from the model, we apply it to the galaxy NGC 4736.

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