A Dearth of Dark Matter in Ordinary Elliptical Galaxies

Details A Dearth of Dark Matter in Ordinary Elliptical Galaxies A Dearth of Dark Matter in Ordinary Elliptical Galaxies

2003-08-28

arxiv.org/abs/astro-ph/0308518v1

Science 301:1696-1698,2003

Astronomy and Astrophysics

Astrophysics

Science, 19 Sep 03, in press, 15 pp., 6 figs (4 color), supporting online material integrated as appendix, uses scicite.sty. S

Scientific paper

10.1126/=

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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