Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121...91m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 1, May 1983, p. 91-96.
Astronomy and Astrophysics
Astrophysics
18
Density Distribution, Orbit Perturbation, Orbital Elements, Spiral Galaxies, Attitude (Inclination), Celestial Mechanics, Milky Way Galaxy
Scientific paper
Orbit calculations have been carried out in a rotating triaxial system having a density distribution in accordance with recent observations of spiral galaxies. A search was made for simple closed orbits that are tilted with respect to the equatorial plane of the galaxy. A new family of stable prograde tilted orbits was found which can explain warps as almost stationary phenomena. The results give strong support to Binney's proposal that warps can be excited by orbital instability. A scenario is described in which gas in the equatorial plane slowly spirals inward, is fed onto the prograde tilted orbits by orbital instability and eventually ends up as high-velocity clouds due to the intersection of the more inclined orbits. No contradictions were found when the characteristic properties of the orbits were compared with the warps of our Galaxy and NGC 2903.
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