A dearth of dark matter in ordinary elliptical galaxies |
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| Authors: | Romanowsky Aaron J Douglas Nigel G Arnaboldi Magda Kuijken Konrad Merrifield Michael R Napolitano Nicola R Capaccioli Massimo Freeman Kenneth C |
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| Affiliation: | School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK. aaron.romanowsky@nottingham.ac.uk |
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| Abstract: | ![]()
The kinematics of the outer parts of three intermediate-luminosity elliptical galaxies were studied with the Planetary Nebula Spectrograph. The galaxies' velocity-dispersion profiles were found to decline with the radius, and dynamical modeling of the data indicates the presence of little if any dark matter in these galaxies' halos. This unexpected result conflicts with findings in other galaxy types and poses a challenge to current galaxy formation theories. |
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