Bahcall–Soneira model of the Milky Way
E938392
The Bahcall–Soneira model of the Milky Way is a pioneering analytic model of our Galaxy’s structure that describes the spatial distribution of stars in its disk and halo, widely used before more detailed modern surveys.
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
Milky Way model
ⓘ
analytic model ⓘ galactic structure model ⓘ |
| appliesTo | Milky Way NERFINISHED ⓘ |
| approach |
phenomenological
ⓘ
semi-empirical ⓘ |
| assumes |
axisymmetric Galaxy
ⓘ
smooth stellar distributions ⓘ |
| characterizedBy |
power-law halo density profile
ⓘ
scale height of the disk ⓘ scale length of the disk ⓘ |
| coordinateSystem | Galactic coordinates ⓘ |
| describes |
spatial distribution of stars in the Milky Way
ⓘ
stellar distribution in the Galactic disk ⓘ stellar distribution in the Galactic halo ⓘ |
| field |
astrophysics
ⓘ
galactic astronomy ⓘ |
| includesComponent |
stellar halo
ⓘ
thick disk ⓘ thin disk ⓘ |
| influenced | later Galactic star-count models ⓘ |
| inputData |
observed star counts
ⓘ
stellar luminosity functions ⓘ |
| models |
Galactic disk
ⓘ
Galactic halo ⓘ stellar number counts ⓘ |
| namedAfter |
John N. Bahcall
NERFINISHED
ⓘ
Raymond J. Soneira NERFINISHED ⓘ |
| pioneering | yes ⓘ |
| predicts |
distribution of apparent magnitudes of stars
ⓘ
distribution of colors of stars ⓘ |
| relatedTo |
Galactic star-count method
ⓘ
Milky Way structure studies ⓘ |
| status | historically important ⓘ |
| supersededBy | modern survey-based Milky Way models ⓘ |
| timePeriodOfUse | late 20th century ⓘ |
| usedFor |
predicting star counts as a function of Galactic latitude
ⓘ
predicting star counts as a function of Galactic longitude ⓘ predicting star counts as a function of magnitude ⓘ |
| uses |
analytic density laws
ⓘ
exponential disk component ⓘ spheroidal halo component ⓘ |
| wasWidelyUsedBefore |
Gaia mission
NERFINISHED
ⓘ
Sloan Digital Sky Survey NERFINISHED ⓘ large digital sky surveys ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.