title: A dearth of dark matter in ordinary elliptical galaxies.
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.
authors.affiliation: School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK. aaron.romanowsky@nottingham.ac.uk
authors.forename: Aaron J
authors.initials: AJ
authors.lastname: Romanowsky
authors.forename: Nigel G
authors.initials: NG
authors.lastname: Douglas
authors.forename: Magda
authors.initials: M
authors.lastname: Arnaboldi
authors.forename: Konrad
authors.initials: K
authors.lastname: Kuijken
authors.forename: Michael R
authors.initials: MR
authors.lastname: Merrifield
authors.forename: Nicola R
authors.initials: NR
authors.lastname: Napolitano
authors.forename: Massimo
authors.initials: M
authors.lastname: Capaccioli
authors.forename: Kenneth C
authors.initials: KC
authors.lastname: Freeman