A Dearth of Dark Matter in Ordinary Elliptical Galaxies

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 an...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 2003-09, Vol.301 (5640), p.1696-1698
Hauptverfasser:	Romanowsky, Aaron J., Douglas, Nigel G., Arnaboldi, Magda, Kuijken, Konrad, Merrifield, Michael R., Napolitano, Nicola R., Capaccioli, Massimo, Freeman, Kenneth C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Company growth Dark matter Dark matter (Astronomy) Dark matter (stellar, interstellar, galactic, and cosmological) Earth, ocean, space Elliptical galaxies Exact sciences and technology Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations Galactic radii Galaxies Growth Kinetics Light Milky Way galactic halo Milky Way Galaxy Modeling Normal galaxies. Extragalactic objects and systems (by type) Orbital velocity Stars & galaxies Stellar radii Stellar systems. Galactic and extragalactic objects and systems. The universe Velocity
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Zusammenfassung:	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.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.1087441