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NGC 5128 - a nearby laboratory for planetary nebulae in a giant early-type galaxy

Published online by Cambridge University Press:  30 August 2012

Jeremy R. Walsh ,
George H. Jacoby ,
Harald Kuntschner ,
Reynier F. Peletier ,
Marina Rejkuba ,
Nicholas A. Walton  and
Kristin A. Woodley
Jeremy R. Walsh
Affiliation:
European Southern Observatory, Garching, Germany
George H. Jacoby
Affiliation:
Giant Magellan Telescope Corporation/Carnegie Observatories, Pasadena, USA
Harald Kuntschner
Affiliation:
European Southern Observatory, Garching, Germany
Reynier F. Peletier
Affiliation:
Kapteyn Astronomical Institute, Groningen, the Netherlands
Marina Rejkuba
Affiliation:
European Southern Observatory, Garching, Germany
Nicholas A. Walton
Affiliation:
Institute for Astronomy, Cambridge, United Kingdom
Kristin A. Woodley
Affiliation:
Department of Physics & Astronomy, University of British Columbia, Canada
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Abstract

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NGC 5128 at 3.8 Mpc is the nearest large elliptical galaxy and is ideally suited to a detailed study of its planetary nebula population. Two spectroscopic programmes are summarised. More than 1200 PNe candidates are known from imaging campaigns in NGC 5128 and accurate radial velocities of 1070 have been measured with the VLT FLAMES/Giraffe spectrometer. From these data a variety of studies of the galaxy kinematics are enabled, such as search for PN sub-groups, representing the relics of accretion of small galaxies. Emission line spectra were observed with VLT FORS and the light element abundances determined for 40 PNe through photoionization modelling. A spread in O abundance of about 0.9 dex is found but no obvious radial gradient out to 19 kpc. Comparison of the O abundance from these PN with the metallicity for the stellar population in the neighbourhood of the PN will probe the star formation and enrichment history of the galaxy. Full results from this analysis will be presented in a forthcoming paper.

Keywords

Planetary nebulae: generalgalaxies: ellipticalgalaxies: individual (NGC 5128)techniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 279 - 282
Copyright
Copyright © International Astronomical Union 2012

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