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Early-type Galaxy Halo Dynamics inferred using the PN Spectrograph
N. G. Douglas, A. J. Romanowsky, K. Kuijken +6
A new instrument is providing crucial data with which to probe the structure of dark halos in elliptical galaxies.
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…
Is there a dichotomy in the Dark Matter as well as in the Baryonic Matter properties of ellipticals?
N. R. Napolitano, M. Capaccioli, M. Arnaboldi +5
We have found a correlation betwen the M/L global gradients and the structural parameters of the luminous components of a sample of 19 early-type galaxies. Such a correlation suppo…
A Dearth of Dark Matter in Ordinary Elliptical Galaxies
Aaron J. Romanowsky, Nigel D. Douglas, Magda Arnaboldi +5
The kinematics of the outer parts of three intermediate-luminosity elliptical galaxies have been studied using the Planetary Nebula Spectrograph. The galaxies' velocity dispersion…
The cluster of galaxies A 2163B at z~0.2 II -- Colour gradients, re--mie relations and the Photometric Plane
F. La Barbera, G. Busarello, P. Merluzzi +3
This paper has been withdrawn by the author(s), since it has been merged with paper I (astro-ph/0307482).
Intracluster stellar population properties from N-body cosmological simulations -- I. Constraints at
N. R. Napolitano, M. Pannella, M. Arnaboldi +8
We use a high resolution collisionless simulation of a Virgo--like cluster in a CDM cosmology to determine the velocity and clustering properties of the diffuse stellar componen…