Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation Curves
The flattening of spiral-galaxy rotation curves is unnatural in view of the expectations from Kepler’s third law and a central mass. It is interesting, however, that the radius-independence velocity is what one expects in one less dimension. In our three-dimensional space, the rotation curve is natu...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/7/9/346 |
| _version_ | 1797517072461201408 |
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| author | Felipe J. Llanes-Estrada |
| author_facet | Felipe J. Llanes-Estrada |
| author_sort | Felipe J. Llanes-Estrada |
| collection | DOAJ |
| description | The flattening of spiral-galaxy rotation curves is unnatural in view of the expectations from Kepler’s third law and a central mass. It is interesting, however, that the radius-independence velocity is what one expects in one less dimension. In our three-dimensional space, the rotation curve is natural if, outside the galaxy’s center, the gravitational potential corresponds to that of a very prolate ellipsoid, filament, string, or otherwise cylindrical structure perpendicular to the galactic plane. While there is observational evidence (and numerical simulations) for filamentary structure at large scales, this has not been discussed at scales commensurable with galactic sizes. If, nevertheless, the hypothesis is tentatively adopted, the scaling exponent of the baryonic Tully–Fisher relation due to accretion of visible matter by the halo comes out to reasonably be 4. At a minimum, this analytical limit would suggest that simulations yielding prolate haloes would provide a better overall fit to small-scale galaxy data. |
| first_indexed | 2024-03-10T07:09:43Z |
| format | Article |
| id | doaj.art-77f4903b3f1c4970b0b88c4d2b932998 |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-10T07:09:43Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-77f4903b3f1c4970b0b88c4d2b9329982023-11-22T15:33:12ZengMDPI AGUniverse2218-19972021-09-017934610.3390/universe7090346Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation CurvesFelipe J. Llanes-Estrada0Departamento de Física Teórica and IPARCOS, Institute for Particle and Cosmological Physics, Universidad Complutense de Madrid, 28040 Madrid, SpainThe flattening of spiral-galaxy rotation curves is unnatural in view of the expectations from Kepler’s third law and a central mass. It is interesting, however, that the radius-independence velocity is what one expects in one less dimension. In our three-dimensional space, the rotation curve is natural if, outside the galaxy’s center, the gravitational potential corresponds to that of a very prolate ellipsoid, filament, string, or otherwise cylindrical structure perpendicular to the galactic plane. While there is observational evidence (and numerical simulations) for filamentary structure at large scales, this has not been discussed at scales commensurable with galactic sizes. If, nevertheless, the hypothesis is tentatively adopted, the scaling exponent of the baryonic Tully–Fisher relation due to accretion of visible matter by the halo comes out to reasonably be 4. At a minimum, this analytical limit would suggest that simulations yielding prolate haloes would provide a better overall fit to small-scale galaxy data.https://www.mdpi.com/2218-1997/7/9/346galactic rotationnonspherical gravitational sourcesmodified gravity |
| spellingShingle | Felipe J. Llanes-Estrada Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation Curves Universe galactic rotation nonspherical gravitational sources modified gravity |
| title | Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation Curves |
| title_full | Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation Curves |
| title_fullStr | Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation Curves |
| title_full_unstemmed | Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation Curves |
| title_short | Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation Curves |
| title_sort | elongated gravity sources as an analytical limit for flat galaxy rotation curves |
| topic | galactic rotation nonspherical gravitational sources modified gravity |
| url | https://www.mdpi.com/2218-1997/7/9/346 |
| work_keys_str_mv | AT felipejllanesestrada elongatedgravitysourcesasananalyticallimitforflatgalaxyrotationcurves |