Planetary nebula velocities in the disc and bulge of M31 |
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| Authors: | 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 M R Merrifield A J Romanowsky K Kuijken M J Irwin |
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| Institution: | Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD;INAF –Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy;Institut für Astrophysik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany;INAF –Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy;Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia;Department of Physics, Queen's University, Kingston, Ontario, Canada K7L 3N6;Institute of Astronomy, Madingley Road, Cambridge CB3 OHA;Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, the Netherlands;School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD;Departamento de Física, Universidad de Concepción, Casilla 160-C, Concepción, Chile;Leiden Observatory, PO Box 9513, NL-2300 RA Leiden, the Netherlands |
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| Abstract: | 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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| Keywords: | galaxies: haloes galaxies: individual: M31 galaxies: spiral |
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