A Preliminary Report on Using Tully Fisher Distances to Constrain Fitting Parameters on Spiral Galaxies

Abstract In a recent galactic survey, Bizyaev et. al. (2021) modeled the rotation curves for 153 ultra-faint, edge-on galaxies using the 3.5 m telescope at the Apache Point Observatory. One of the interesting features of this survey was that the majority of the distances for the galaxies were inferred using the Tully Fisher Relation. Although there is nothing new about surveys using Tully Fisher for distance estimates, these authors reported drastically different scale lengths for some of these galaxies within a one year time frame. Since rotation curve modeling for any theory is most sensitive to the distance, an opportunity arises in this survey to begin to try to shed some light on how galactic rotation curves are derived for any theory. However, the preliminary analysis shows that this survey may not hold the key to unraveling some of these mysteries, but can provide insight into the methods for a more standard fit for rotation curve physics.