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1 results

  • Dark Matter in NGC 2974

  • A. Weijmans, D. Krajnović, T. A. Oosterloo, R. Morganti, P. T. de Zeeuw
  • Journal:
    Proceedings of the International Astronomical Union / Volume 2 / Issue S235 / August 2006
    Published online by Cambridge University Press:
    01 August 2006, p. 147
    Print publication:
    August 2006
    • Article
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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†.