Planetary nebulae as probes of dark matter in NGC 3384

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Title: Planetary nebulae as probes of dark matter in NGC 3384
Author: Benoit, Tremblay; Merritt, David; Williams, Ted
Abstract: We have obtained radial velocities of 68 planetary nebulae (PNs) surrounding the SB0 galaxy NGC 3384 in the Leo I group, using the CTIO 4 m telescope and the Rutgers Fabry-Perot interferometer. The PN system exhibits a well-ordered rotation field aligned with the photometric axes of the galaxy. The rotation curve is flat from about 2 kpc until at least 7 kpc. We infer a lower limit of 0.7 x 10 11M. for the mass of NGC 3384. Our results imply that at least a third of the dynamical mass of the NGC 3379/3384 system -- estimated by Schneider (1985) to be roughly 6 x 10 11M. -- may be accounted for in the two bright galaxies. (Refer to PDF file for exact formulas).
Description: Also archived in: astro-ph/9510098 19 Oct 1995
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Date: 1995-04-10

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