3 papers
astro-ph2003
Simulations of Normal Spiral Galaxies
Roelof Bottema
Results are presented of numerical simulations of normal isolated late type spiral galaxies. Specifically the galaxy NGC 628 is used as a template. The method employs a TREESPH cod…
astro-ph1999
The kinematics of the bulge and the disc of NGC 7331
Roelof Bottema
Presented are spectroscopic emission and absorption line observations along the major axis of the Sb galaxy NGC 7331. The kinematics of the ionized gas and the stars appears to be…
astro-ph1997
The maximum rotation of a galactic disc
Roelof Bottema
The observed stellar velocity dispersions of galactic discs show that the maximum rotation of a disc is on average 63% of the observed maximum rotation. This criterion can, however…