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Cambridge University Press, Proceedings of the International Astronomical Union, S244(3), p. 289-294, 2007

DOI: 10.1017/s1743921307014111

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

Journal article published in 2007 by N. R. Napolitano, M. Capaccioli, L. Coccato, A. J. Romanowsky, N. G. Douglas, M. Arnaboldi, K. Kuijken ORCID, M. R. Merrifield ORCID, E. Noordermeer, K. C. Freeman, O. Gerhard, F. De Lorenzi, P. Das
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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 (f_DM=M_DM/M_star) and the galaxy luminosity and mass. Comment: 5 pages, 2 figures. To appear in the proceedings of the IAU Symposium 244 "Dark Galaxies and Lost Baryons", Cardiff 25-29 June 2007, eds. J.I. Davies & M.J. Disney