A Dearth of Dark Matter in Ordinary Elliptical Galaxies
2003; American Association for the Advancement of Science; Volume: 301; Issue: 5640 Linguagem: Inglês
10.1126/science.1087441
ISSN1095-9203
AutoresAaron J. Romanowsky, Nigel G. Douglas, M. Arnaboldi, Konrad Kuijken, M. R. Merrifield, N. R. Napolitano, Massimo Capaccioli, K. C. Freeman,
Tópico(s)Stellar, planetary, and galactic studies
ResumoThe 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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