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Planetary Nebulae in Face-On Spiral Galaxies. III. Planetary Nebula Kinematics and Disk Mass
Kimberly A. Herrmann, Robin Ciardullo
Much of our understanding of dark matter halos comes from the assumption that the mass-to-light ratio (M/L) of spiral disks is constant. The best way to test this hypothesis is to…
Planetary Nebulae in Face-On Spiral Galaxies. II. Planetary Nebula Spectroscopy
Kimberly A. Herrmann, Robin Ciardullo
As the second step in our investigation of the mass-to-light ratio of spiral disks, we present the results of a spectroscopic survey of planetary nebulae (PNe) in five nearby, low-…
Kinematic Evidence for Halo Substructure in Spiral Galaxies
Kimberly A. Herrmann, Robin Ciardullo, Steinn Sigurdsson
We present the results of a kinematic study of planetary nebulae in the extreme outskirts of two spiral galaxies, M83 (NGC 5236) and M94 (NGC 4736). We find that in the inner regio…