Milky Way bulge and bar
E929784
The Milky Way bulge and bar is the dense, elongated central stellar structure of our Galaxy, composed of an old, metal-rich stellar population that dominates its inner gravitational potential and strongly influences its overall dynamics.
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
galactic bulge
ⓘ
stellar bar ⓘ |
| affects |
orbits of stars in the inner disk
ⓘ
star formation in the inner Galaxy ⓘ |
| alignedApproximatelyWith | Galactic plane NERFINISHED ⓘ |
| classifiedAs | pseudobulge by many studies ⓘ |
| composedOf |
metal-rich stars
ⓘ
old stars ⓘ |
| contains |
RR Lyrae stars
NERFINISHED
ⓘ
dust ⓘ globular clusters ⓘ interstellar gas ⓘ red clump stars ⓘ red giant stars ⓘ |
| dominates | inner gravitational potential of the Milky Way ⓘ |
| drives | secular evolution of the Milky Way disk ⓘ |
| extendsFrom | Galactic center NERFINISHED ⓘ |
| formedPrimarilyBy | secular evolution of the Galactic disk ⓘ |
| funnels | gas toward the Galactic center ⓘ |
| hasAge | mostly older than 8–10 billion years ⓘ |
| hasBarMass | of order 10^10 solar masses ⓘ |
| hasBulgeMass | of order 10^10 solar masses ⓘ |
| hasComponent |
Milky Way bar
NERFINISHED
ⓘ
Milky Way bulge NERFINISHED ⓘ |
| hasKinematics |
cylindrical rotation
ⓘ
high velocity dispersion ⓘ |
| hasLength | about 3–5 kiloparsecs ⓘ |
| hasMetallicity | near-solar or super-solar for dominant population ⓘ |
| hasMetallicityGradient | negative with increasing distance from Galactic plane ⓘ |
| hasMorphology |
barred bulge
ⓘ
boxy/peanut-shaped bulge ⓘ |
| hasOrientationAngle | about 20–30 degrees to the Sun–Galactic-center line ⓘ |
| hasResonance |
corotation resonance in the inner disk
GENERATED
ⓘ
inner Lindblad resonance GENERATED ⓘ |
| hasShape | elongated ⓘ |
| hasStellarPopulation |
predominantly metal-rich stellar population
ⓘ
predominantly old stellar population ⓘ |
| hasTotalMass | several 10^10 solar masses ⓘ |
| influences | global dynamics of the Milky Way ⓘ |
| is | non-axisymmetric structure ⓘ |
| locatedIn | central region of the Milky Way ⓘ |
| mayContain | small classical bulge component ⓘ |
| observedBy |
COBE satellite
NERFINISHED
ⓘ
Gaia mission NERFINISHED ⓘ Spitzer Space Telescope NERFINISHED ⓘ |
| observedIn | infrared wavelengths ⓘ |
| partOf | Milky Way NERFINISHED ⓘ |
| patternSpeed | of order 30–60 km/s/kpc ⓘ |
| supports | boxy/peanut bulge via bar instabilities ⓘ |
| tracedBy |
near-infrared star counts
ⓘ
red clump giant stars ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.