[31.07] Halo masses of early-type galaxies: theory vs observation

AAS 205th Meeting, 9-13 January 2005
Session 31 Evolution of Ellipticals and Dark Matter Halos
Oral, Monday, January 10, 2005, 10:00-11:30am, California

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[31.07] Halo masses of early-type galaxies: theory vs observation

A.J. Romanowsky (Concepcion), N.R. Napolitano (Kapteyn), M. Capaccioli (Capodimonte), N.G. Douglas (Kapteyn), M.R. Merrifield (Nottingham), K. Kuijken (Leiden), O. Gerhard (Basel), M. Arnaboldi (Torino), K.C. Freeman (RSAA)

We introduce a mass-to-light gradient parameter to describe the amount of dark matter surrounding early-type galaxies. Assembling kinematic data from the literature on the halo masses of 20 galaxies, we find a correlation between luminosity and gradient. The gradients do not fit in well with predictions from LCDM, requiring either baryon excess or diffuse halos

We also describe various programs using planetary nebulae, globular clusters, and X-rays to jointly determine galaxy halo masses.

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