A Dearth of Dark Matter in Ordinary Elliptical Galaxies
Astrophysics
2009-11-10 v1
Abstract
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.
Cite
@article{arxiv.astro-ph/0308518,
title = {A Dearth of Dark Matter in Ordinary Elliptical Galaxies},
author = {Aaron J. Romanowsky and Nigel D. Douglas and Magda Arnaboldi and Konrad Kuijken and Michael R. Merrifield and Nicola R. Napolitano and Massimo Capaccioli and Kenneth C. Freeman},
journal= {arXiv preprint arXiv:astro-ph/0308518},
year = {2009}
}
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 http://astro.nottingham.ac.uk/~romanow/res.html and Science Express online at http://www.sciencemag.org/cgi/content/abstract/1087441v1