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

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

2007-09-11

arxiv.org/abs/0709.1636v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures. To appear in the proceedings of the IAU Symposium 244 "Dark Galaxies and Lost Baryons", Cardiff 25-29 June

Scientific paper

10.1017/S1743921307014111

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.

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