Published in
Cambridge University Press (CUP), 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
,
A.~J J. Romanowsky,
L. Coccato,
M. Capaccioli,
N.~G G. Douglas,
E. Noordermeer,
M.~R R. Merrifield ,
K. Kuijken,
M. Arnaboldi ,
O. Gerhard,
K.~C C. Freeman ,
F. De Lorenzi,
P. Das
Full text: Unavailable
Abstract
AbstractWe 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 (Romanowskyet 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.
