The Virgo High-Resolution CO Survey: III. NGC 4254

We present high-angular-resolution (1. �� 5–5 �� ) interferometer observations of the 12 CO (J = 1–0) line emission in the central region of the SA(s)c galaxy NGC 4254 (M 99). The observations were obtained using the Nobeyama Millimeter-wave Array (NMA) during the course of a long-term CO-line survey of Virgo spirals. We present the spectra, channel maps, integrated intensity distributions, velocity fields, position–velocity diagrams, and compare the data with various optical images. The rotation velocity is already finite at the nucleus, or at least it rises steeply

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