| _version_ | 1866901467703541760 |
|---|---|
| author | Gerőcs, Tamás |
| author_facet | Gerőcs, Tamás |
| contents | <p>We introduce a galaxy-level outer amplitude diagnostic (A_out) to quantify rotation-curve anomalies in disk galaxies using the SPARC dataset.</p> <p>We find a strong monotonic anti-correlation between A_out and outer baryonic acceleration (Spearman ρ ≈ −0.85), robust under multiple null tests and alternative baryonic modelling pipelines.</p> <p>The effect is amplitude-dominated (outer-region), rather than shape-dominated, and persists across independent surveys (SPARC, THINGS, LITTLE THINGS, GHASP), with consistent trend direction but non-universal normalization.</p> <p>These results provide evidence that outer amplitude variations represent a significant empirical feature of galaxy rotation curves, and place new constraints on galaxy dynamics models.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_19186820 |
| institution | Zenodo |
| language | eng |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Amplitude-Dominated Outer Rotation-Curve Anomalies in Disk Galaxies Gerőcs, Tamás galaxy rotation curves dark matter modified gravity SPARC galaxy dynamics <p>We introduce a galaxy-level outer amplitude diagnostic (A_out) to quantify rotation-curve anomalies in disk galaxies using the SPARC dataset.</p> <p>We find a strong monotonic anti-correlation between A_out and outer baryonic acceleration (Spearman ρ ≈ −0.85), robust under multiple null tests and alternative baryonic modelling pipelines.</p> <p>The effect is amplitude-dominated (outer-region), rather than shape-dominated, and persists across independent surveys (SPARC, THINGS, LITTLE THINGS, GHASP), with consistent trend direction but non-universal normalization.</p> <p>These results provide evidence that outer amplitude variations represent a significant empirical feature of galaxy rotation curves, and place new constraints on galaxy dynamics models.</p> |
| title | Amplitude-Dominated Outer Rotation-Curve Anomalies in Disk Galaxies |
| topic | galaxy rotation curves dark matter modified gravity SPARC galaxy dynamics |
| url | https://doi.org/10.5281/zenodo.19186820 |