| _version_ | 1866901196235603968 |
|---|---|
| author | Doumbouya, Lisa Michelle |
| author_facet | Doumbouya, Lisa Michelle |
| contents | <p>Radio observations of spiral galaxies using the 21-cm neutral hydrogen line reveal that large-scale spiral structure persists in the gaseous disk even where stellar density is low. These observations demonstrate that spiral arms are not merely distributions of stars but correspond to organized density-wave modes propagating through the rotating disk medium - spiral density waves are large-scale structural modes of rotating disk systems. Surveys of galaxies such as Messier 51 and NGC 6946 show continuous spiral structures extending well beyond the visible stellar disk.</p> <p>Within a structure-first framework, these patterns are consistent with large-scale admissible modes of a rotating medium in which matter accumulates along dynamically selected pathways. This interpretation is compatible with classical density-wave theory while situating spiral structure within a broader framework in which organized geometries constrain the modes available to physical systems. </p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_19067296 |
| institution | Zenodo |
| language | |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Consilience Note: Spiral Density Waves in Galactic Disks as Large-Scale Structural Modes Doumbouya, Lisa Michelle astrophysics radio astronomy cosmology spiral galaxies spiral density waves, galactic disks 21cm hydrogen line neutral hydrogen (HI) density-wave theory galactic structure interstellar medium star formation large-scale structure rotating disk dynamics galactic modes Messier 51 NGC 6946 <p>Radio observations of spiral galaxies using the 21-cm neutral hydrogen line reveal that large-scale spiral structure persists in the gaseous disk even where stellar density is low. These observations demonstrate that spiral arms are not merely distributions of stars but correspond to organized density-wave modes propagating through the rotating disk medium - spiral density waves are large-scale structural modes of rotating disk systems. Surveys of galaxies such as Messier 51 and NGC 6946 show continuous spiral structures extending well beyond the visible stellar disk.</p> <p>Within a structure-first framework, these patterns are consistent with large-scale admissible modes of a rotating medium in which matter accumulates along dynamically selected pathways. This interpretation is compatible with classical density-wave theory while situating spiral structure within a broader framework in which organized geometries constrain the modes available to physical systems. </p> |
| title | Consilience Note: Spiral Density Waves in Galactic Disks as Large-Scale Structural Modes |
| topic | astrophysics radio astronomy cosmology spiral galaxies spiral density waves, galactic disks 21cm hydrogen line neutral hydrogen (HI) density-wave theory galactic structure interstellar medium star formation large-scale structure rotating disk dynamics galactic modes Messier 51 NGC 6946 |
| url | https://doi.org/10.5281/zenodo.19067296 |