Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-13
Astronomy and Astrophysics
Astrophysics
10 pages including 6 figures. Shortened version to appear in proceedings of the JENAM-2002 meeting, Porto, Portugal, 2002
Scientific paper
The relationship between the geometrical properties of stellar disks (a flatness and truncation radius) and the disk kinematics are considered for edge-on galaxies. It is shown that the observed thickness of the disks and the approximate constancy of their thickness along the radius well agrees with the condition of their marginal local gravitational stability. As a consequence, those galaxies whose disks are thinner should harbor more massive dark haloes. The correlation between the de-projeced central brightness of the disks and their flatness is found (the low surface brightness disks tend to be the thinniest ones). We also show that positions of observed photometrically determined truncation radii $R_{cut}$ for the stellar disks support the idea of marginal local gravitational stability of gaseous protodisks at $R =R_{cut}$, and hence the steepening of photometric profiles may be a result of too inefficient star formation beyond $R_{cut}$.
Bizyaev D. V.
Zasov Anatoli V.
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