FDG RESULTS FOR NGC 2841

NGC 2841 is an unbarred spiral galaxy in the constellation of Ursa Major and approximately 46 million light-years away. This galaxy possesses a central spherical bulge, but with the stellar disk component becoming prominent at small radial distances. The gas component is also present, but less prominent than the other two. NFDG results for NGC 2841 are described in the figure below: the top panel shows the variable dimension D(R) (red-solid curve) computed with the main NFDG model, and the new mass-dimension function D_m(R) (blue-dashed curve), computed with the NFDG field equation. Both dimensions are very close to values in the range D=1.9-2.1, over most of the radial range. This is typical NFDG behavior for galactic structures dominated by an axially-symmetric stellar disk component. Bottom panel: NFDG galactic rotation curves compared with SPARC data. There is perfect agreement between the main NFDG D(R) curve (red-solid) and the experimental data. This shows that, if this galaxy behaves as a fractal structure whose dimension D follows the red-solid curve in the top panel, then the resulting NFDG circular velocity curve in the bottom panel (red-solid) will perfectly fit the experimental data, without any need of dark matter. The NFDG D_m(R) curve (blue-dashed) is less effective in fitting the experimental data, but can still capture the overall trend of the data.

A disk-dominated galaxy, such as NGC 2841, is characterized by a fractional dimension which is very close to D=2. This is due to the axially-symmetric, flattened-disk shape of this galaxy (see also similar galaxies NGC 3198 and NGC 6503). The bulge and gas components are less important for this galaxy. See my seventh paper for a full discussion of this galaxy.