A Dearth of Dark Matter in Ordinary Elliptical Galaxies
Aaron J. Romanowsky, Nigel D. Douglas, Magda Arnaboldi, Konrad Kuijken, Michael R. Merrifield, Nicola R. Napolitano, Massimo Capaccioli, Kenneth C. Freeman
Abstract
The kinematics of the outer parts of three intermediate-luminosity elliptical galaxies have been studied using the Planetary Nebula Spectrograph. The galaxies' velocity dispersion profiles are found to decline with radius; dynamical modeling of the data indicates the presence of little if any dark matter in these galaxies' halos. This surprising result conflicts with findings in other galaxy types, and poses a challenge to current galaxy formation theories.
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