4 papers · 1 filter
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…
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…
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…
Formation of the Galactic Halo
Ortwin Gerhard
Recent observational and theoretical work suggests that the formation of the Galactic stellar halo involved both dissipative processes and the accretion of subfragments. With prese…