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Planetary nebula velocities in the disc and bulge of M31
Monthly Notices of the Royal Astronomical Society (2006)
  • C. Halliday
  • D. Carter
  • T. J. Bridges
  • Z. C. Jackson
  • M. I. Wilkinson
  • D. P. Quinn
  • N. W. Evans
  • N. G. Douglas
  • H. R. Merrett, University of Nottingham
  • Aaron J. Romanowsky, San Jose State University
  • K. Kuijken
  • M. J. Irwin

We present radial velocities for a sample of 723 planetary nebulae in the disc and bulge of M31, measured using the WYFFOS fibre spectrograph on the William Herschel Telescope. Velocities are determined using the [O III] λ5007 emission line. Rotation and velocity dispersion are measured to a radius of 50 arcmin (11.5 kpc), the first stellar rotation curve and velocity dispersion profile for M31 to such a radius. Our kinematics are consistent with rotational support at radii well beyond the bulge effective radius of 1.4 kpc, although our data beyond a radius of 5 kpc are limited. We present tentative evidence for kinematic substructure in the bulge of M31 to be studied fully in a later work. This paper is part of an ongoing project to constrain the total mass, mass distribution and velocity anisotropy of the disc, bulge and halo of M31.

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Copyright © 2006 Oxford University Press. The published article may be found at :
Citation Information
C. Halliday, D. Carter, T. J. Bridges, Z. C. Jackson, et al.. "Planetary nebula velocities in the disc and bulge of M31" Monthly Notices of the Royal Astronomical Society Vol. 369 Iss. 1 (2006)
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