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No GOD In Elliptical Galaxies

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Posted by Richard Ruquist on August 29, 2003 15:31:49 UTC

A Dearth of Dark Matter in Ordinary Elliptical Galaxies
Authors: Aaron J. Romanowsky, Nigel D. Douglas, Magda Arnaboldi, Konrad Kuijken, Michael R. Merrifield, Nicola R. Napolitano, Massimo Capaccioli, Kenneth C. Freeman
Comments: Science, 19 Sep 03, in press, 15 pp., 6 figs (4 color), supporting online material integrated as appendix, uses scicite.sty. See high-res version at this http URL and Science Express online at this http URL
Journal-ref: A. J. Romanowsky et al., Science Express Reports, 28 August 2003 (10.1126/science.1087441)

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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