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The Thickness of Stellar Disks of Edge-on Galaxies and Their Truncation Radii

Published online by Cambridge University Press:  22 December 2003

C. Boily ,
P. Patsis ,
S. Portegies ,
R. Spurzem ,
C. Theis ,
A. V. Zasov  and
D. V. Bizyaev
A. V. Zasov
Affiliation:
Sternberg Astronomical Institute, University prosp., 13, 119899 Moscow, Russia
D. V. Bizyaev
Affiliation:
Sternberg Astronomical Institute, University prosp., 13, 119899 Moscow, Russia; Physics Dept., UTEP, El Paso, TX 79968, USA
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Abstract

The relationship between geometrical properties of stellar disks(the flatness and the truncation radius) and disk kinematics areconsidered for edge-on galaxies. It is shown that the observedthickness of the disksagrees with the condition of marginal local gravitationalstability. As a consequence, those galaxies whose disks arethinner should harbor more massive dark halos. A correlationbetween the de-projected central brightness of disks and theirflatness is found (low surface brightness disks tend to be thethinnest ones).We also show that the positions of the observed photometricallydetermined truncation radiiRcut of stellar disks agree well with the hypothesisof marginal local gravitational stability of gaseousproto-disks at R = Rcut.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 10: JENAM 2002, Galactic & Stellar Dynamics , 2003 , pp. 121
Copyright
© EAS, EDP Sciences, 2003

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