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Dark Matter in NGC 2974

Published online by Cambridge University Press:  01 August 2006

A. Weijmans ,
D. Krajnović ,
T. A. Oosterloo ,
R. Morganti  and
P. T. de Zeeuw
A. Weijmans
Affiliation:
Leiden Observatory, Leiden University, Postbus 9513, 2300 RA Leiden, the Netherlands email: weijmans@strw.leidenuniv.nl
D. Krajnović
Affiliation:
University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH
T. A. Oosterloo
Affiliation:
ASTRON, Postbus 2, 7990 AA Dwingeloo, the Netherlands Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, the Netherlands
R. Morganti
Affiliation:
ASTRON, Postbus 2, 7990 AA Dwingeloo, the Netherlands Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, the Netherlands
P. T. de Zeeuw
Affiliation:
Leiden Observatory, Leiden University, Postbus 9513, 2300 RA Leiden, the Netherlands email: weijmans@strw.leidenuniv.nl
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Abstract

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We present HI observations of the elliptical galaxy NGC 2974, obtained with the VLA. These observations reveal that the previously detected HI disc in this galaxy (Kim et al. 1988) is in fact a ring. Combining the flat rotation curve with the central kinematics of the ionised gas, obtained with the integral-field spectrograph SAURON, allows us to determine the mass-to-light ratio M/L as a function of radius, ranging from 100 pc in the centre to 10 kpc at the edges of the HI ring. A dark halo is required to explain the observed rotation: at the outer radii ~70% of the total mass is dark†.

Keywords

galaxies: elliptical and lenticulargalaxies: neutral hydrogengalaxies: haloesgalaxies: individual: NGC 2974
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 147
Copyright
Copyright © International Astronomical Union 2007

References

Kim, D.-W., Jura, M., Guhathakurta, P., Knapp, G.R., van Gorkom, J.H., 1988, ApJ 330, 684.Google Scholar