NGC2613, 3198, 6503, 7184: Case studies against `maximum' disks

Details NGC2613, 3198, 6503, 7184: Case studies against `maximum' disks NGC2613, 3198, 6503, 7184: Case studies against `maximum' disks

1998-12-02

arxiv.org/abs/astro-ph/9812048v1

Astronomy and Astrophysics

Astrophysics

Latex, 4 pages, 3 figures. To appear in the proceedings of the `Galaxy Dynamics' conference held at Rutgers Univ., August 8-12

Scientific paper

Decompositions of the rotation curves of NGC2613, 3198, 6505, and 7184 are analysed. For these galaxies the radial velocity dispersions of the stars have been measured and their morphology is clearly discernible. If the parameters of the decompositions are chosen according to the `maximum' disk hypothesis, the Toomre Q stability parameter is systematically less than one and the multiplicities of the spiral arms as expected from density wave theory are inconsitent with the observed morphologies of the galaxies. The apparent Q<1 instability, in particular, is a strong argument against the `maximum' disk hypothesis.

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