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. © 1996. The American Astronomical Society. All rights reserved.
CITATION STYLE
Arnaboldi, M., Freeman, K. C., Mendez, R. H., Capaccioli, M., Ciardullo, R., Ford, H., … Quinn, P. J. (1996). The Kinematics of the Planetary Nebulae in the Outer Regions of NGC 4406. The Astrophysical Journal, 472(1), 145–152. https://doi.org/10.1086/178050
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