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NGC 3741 is a gas-dominated spiral galaxy. It is an irregular galaxy in the constellation Ursa Major and was discovered by John Herschel in 1828. NFDG results for NGC 3741 are shown below: the top panel shows the variable dimension D as a function of the radial distance R, computed with NFDG models. This dimension is very close to a constant value D=1.4-1.6 over most of the radial range. Results for low-R values (below the gray vertical line) were extrapolated and are not completely reliable. Bottom panel: NFDG galactic rotation curves compared with SPARC data. There is almost perfect agreement between the main NFDG (SPARC) curve (green-solid) and the experimental data. This shows that, if this galaxy behaves as a fractal structure whose dimension D follows the green-solid curve in the top panel, the resulting NFDG circular velocity curve in the bottom panel (green-solid) will perfectly fit the experimental data, without any need of dark matter.

A gas-dominated galaxy such as NGC 3741, might be characterized by a fractional dimension smaller than the D=2 value that we observed for a disk-dominated galaxy, such as NGC 6503. It should be noted that, at the lowest values of the radial distance where the disk component dominates, the effective fractional dimension seems to be closer to D=2. The dimension D then decreases toward D=1.4-1.6 in the region dominated by the gas component. See my third paper (published version) for a full discussion of this galaxy.

NFDG analysis of NGC 3741. Top panel: variable space dimension D as a function of the radial distance R. Bottom panel: NFDG rotation curves (circular velocity vs. radial distance) compared to the original SPARC data.