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arxiv: astro-ph/0308518 · v1 · submitted 2003-08-28 · 🌌 astro-ph

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 This is my paper
classification 🌌 astro-ph
keywords galaxiesdarkellipticalgalaxymatterbeenchallengeconflicts
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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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