Determination of the pattern speed in the grand design spiral galaxy NGC 4321.
Measurement of pattern speeds has been an observational imperative in the last years since a clear determination of the corotation resonance radius will give some insight in the nature of density waves and in the mechanism of their maintenance. In this paper we analyse in detail the practical application to the grand design spiral NGC 4321 of two
Sempere, M. J. et al.
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1995