HIGHLIGHTS
- What: The authors aim to identify cases of independent spiral patterns for galaxies with a flat rotation curve and to investigate what relative pattern velocities Ωout p /Ωp they might have for all possible cases of coupling between the main resonances. The authors find a strongly confirmed apparent resonance coupling for six galaxies and the authors show that the observed $ is in agreement with theory. It is also important to note that coupling with bar is better studied, but the authors focus on the spiral-spiral case, and most or all of the above examples have been . . .
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