The Kinematics of the Planetary Nebulae in the Outer Regions of NGC 4406

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Abstract
We have measured the velocities of 19 planetary nebulae (PNs) in the outer regions of the giant early-type galaxy NGC 4406 in the Virgo cluster. The kinematics of the outermost regions, at a mean radius of 142" or 11 kpc, show rapid rotation and a low observed velocity dispersion (~ 166 and 96 km s−1, respectively) , compared with the central velocity dispersion of about 210 km s−1. This supports the classification of this galaxy as an S0. Although this galaxy has a systemic velocity of -227 km s−1, we found three PNs with velocities close to the mean velocity of the Virgo cluster (about 1400 km s−1). We argue that these three PNs may be members of an intracluster stellar population in the Virgo cluster.

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