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Stellar bars and spiral arms co-exist and co-evolve in most disc galaxies inthe local Universe. However, the physical nature of this interaction remains amatter of debate. In this work, we present a set of numerical simulations basedon isolated galactic models aimed to explore how the bar properties affect theinduced spiral structure. We cover a large combination of bar properties,including the bar length, axial ratio, mass and rotation rate. We use threegalactic models describing galaxies with rising, flat and declining rotationcurves. We found that the pitch angle best correlates with the bar patternspeed and the spiral amplitude with the bar quadrupole moment. Our resultssuggest that galaxies with declining rotation curves are the most efficientforming grand design spiral structure, evidenced by spirals with largeramplitude and pitch angle. We also test the effects of the velocity ellipsoidin a subset of simulations. We found that as we increase the radial anisotropy,spirals increase their pitch angle but become less coherent with smalleramplitude.

How the bar properties affect the induced spiral structure