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Dark-Matter Content of Early-Type Galaxies with Planetary Nebulae

Published online by Cambridge University Press:  01 June 2007

N. R. Napolitano ,
A. J. Romanowsky ,
L. Coccato ,
M. Capaccioli ,
N. G. Douglas ,
E. Noordermeer ,
M. R. Merrifield ,
K. Kuijken ,
M. Arnaboldi  and
O. Gerhard
...Show all authors
N. R. Napolitano
Affiliation:
INAF-Observatory of Capodimonte, Napoli, Italy email: napolita@na.astro.it
A. J. Romanowsky
Affiliation:
Departamento de Física, Universidad de Concepción, Chile
L. Coccato
Affiliation:
MPE – Garching, Germany
M. Capaccioli
Affiliation:
Department of Physics, University “Federico II” Naples INAF – VSTceN, Naples, Italy
N. G. Douglas
Affiliation:
Kapteyn Institute, Groningen, the Netherlands
E. Noordermeer
Affiliation:
University of Nottingham, UK
M. R. Merrifield
Affiliation:
University of Nottingham, UK
K. Kuijken
Affiliation:
University of Leiden, the Netherlands
M. Arnaboldi
Affiliation:
ESO – Garching, Germany
O. Gerhard
Affiliation:
MPE – Garching, Germany
K. C. Freeman
Affiliation:
RSAA, Mt. Stromlo Observatory, Australia
F. De Lorenzi
Affiliation:
MPE – Garching, Germany
P. Das
Affiliation:
MPE – Garching, Germany
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Abstract

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We examine the dark matter properties of nearby early-type galaxies using planetary nebulae (PNe) as mass probes. We have designed a specialised instrument, the Planetary Nebula Spectrograph (PN.S) operating at the William Herschel telescope, with the purpose of measuring PN velocities with best efficiency. The primary scientific objective of this custom-built instrument is the study of the PN kinematics in 12 ordinary round galaxies. Preliminary results showing a dearth of dark matter in ordinary galaxies (Romanowsky et al. 2003) are now confirmed by the first complete PN.S datasets. On the other hand early-type galaxies with a “regular” dark matter content are starting to be observed among the brighter PN.S target sample, thus confirming a correlation between the global dark-to-luminous mass virial ratio (fDM = MDMM*) and the galaxy luminosity and mass.

Keywords

galaxies: haloesevolutionkinematics and dynamicsdark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 289 - 294
Copyright
Copyright © International Astronomical Union 2008

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