Created
January 4, 2017 19:51
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A very simple bar model for the Milky Way in galpy
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Sorry for my slow reply (this would be better as a galpy Discussion). The SpiralArmsPotential is a pure perturbation potential, so doesn't change the total mass when adding it to a potential. When you change the number of spiral arms, I believe the relative density perturbation will change, you can test by just evaluating the density along a circle at, say, R=8 kpc.
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Dear Bovy,
Does the amplitude you recommend take into account the conservation of the mass distribution?
Additionally, what happens if I change the number of spiral arms from 2 to 4?
Thank you!