Mapping dark matter around early type galaxies

Details Mapping dark matter around early type galaxies Mapping dark matter around early type galaxies

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aipc..336..149t&link_type=abstract

Dark matter. AIP Conference Proceedings, Volume 336, pp. 149-152 (1995).

Physics

Dark Matter, Visible, Lenticular Galaxies, Planetary Nebulae

Scientific paper

We have measured velocities of 67 planetary nebulae around the SB0 galaxy NGC 3384. The measurements were taken with the Rutgers Fabry-Pérot interferometer on the CTIO 4m telescope. The planetary nebulae display a well-ordered rotation field aligned with the photometric axes of the galaxy, with a peak velocity of 140 km s-1 at ~2 kpc and flat thereafter. We infer that the galaxy has a mass-to-light ratio M/LB>~9. Our result implies that at least a third of the mass of the NGC 3379/3384 group-estimated by Schneider (1985) to be ~6×1011 Msolar-may be accounted for in the two bright galaxies.

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