3 papers
astro-ph2004
Galaxy dynamics with the Planetary Nebula Spectrograph
N. R. Napolitano, A. J. Romanowsky, N. G. Douglas +6
The Planetary Nebula Spectrograph is a dedicated instrument for measuring radial velocity of individual Planetary Nebulae (PNe) in galaxies. This new instrument is providing crucia…
astro-ph2003
Elliptical Galaxies: Darkly Cloaked or Scantily Clad?
A. J. Romanowsky, N. G. Douglas, K. Kuijken +7
Planetary nebulae (PNe) may be the most promising tracers in the halos of early-type galaxies. We have used multi-object spectrographs on the WHT and the VLT, and the new Planetary…
astro-ph2003
Large-scale Gas Dynamics in the Milky Way
P. Englmaier, O. E. Gerhard, N. Bissantz
We present new gas flow models for the Milky Way inside the solar circle. Using a mass model derived from the COBE/DIRBE maps and clump giant star counts, and using a parametric mo…