A Stars-Gas Dual Fit Result in the `constant Lagrangian' Model for Galactic Dynamics When Applied to the Sparc Database

Authors: E.P.J. de Haas

In this paper I apply the `constant Lagrangian' model for galactic dynamics to a subset of the SPARC database. I will fit $25$ galaxies from this database using the dual fit approach. This means that one fit is made for the stars dominated region of one galaxy. Another fit is added for the gas dominated region of the same galaxy. Both are presented in one single graph. The switch from stars dominated to gas dominated is sometimes visible as a ``wiggle'' in the total rotation velocity, as for exampe in the rotation curve of NGC 1560. I will demonstrate that this more or less visible``wiggle'' is part of the rotation velocity curve of almost every galaxy in the sample. The dual fit approach results in a rotation curve fit that mostly remains within the observational error margins.

Comments: 41 Pages.

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[v1] 2018-05-01 11:27:05

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