Orion Bar
E460827
Orion Bar is a bright, elongated photodissociation region at the edge of the Orion Nebula, where intense ultraviolet radiation from young massive stars shapes and illuminates dense molecular gas and dust.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
astrophysical structure
ⓘ
photodissociation region ⓘ |
| astronomicalRegionType |
bright rim
ⓘ
ionization front ⓘ photon-dominated region ⓘ |
| contains |
atomic gas
ⓘ
dense molecular gas ⓘ interstellar dust ⓘ ionized gas ⓘ |
| distanceFromEarth |
approximately 1350 light-years
ⓘ
approximately 414 parsecs ⓘ |
| hasDensityGradient | true ⓘ |
| hasNearbyExcitingStars | Theta1 Orionis C NERFINISHED ⓘ |
| hasPhysicalProcess |
heating by photoelectric effect on dust grains
ⓘ
molecular hydrogen excitation ⓘ photodissociation of molecules ⓘ photoevaporation flows ⓘ photoionization ⓘ polycyclic aromatic hydrocarbon emission ⓘ |
| hasSharpTransitionBetween | ionized gas and molecular gas ⓘ |
| hasStrongEmissionFrom |
carbon monoxide
ⓘ
fine-structure lines of ionized atoms ⓘ ionized carbon ⓘ molecular hydrogen ⓘ polycyclic aromatic hydrocarbons ⓘ |
| hasTemperatureGradient | true ⓘ |
| illuminatedBy | ultraviolet radiation ⓘ |
| isBright | true ⓘ |
| isEdgeOn | true ⓘ |
| isElongated | true ⓘ |
| isShapedBy | Theta1 Orionis C NERFINISHED ⓘ |
| isTargetOf |
ALMA observations
ⓘ
Herschel Space Observatory observations ⓘ Hubble Space Telescope observations ⓘ Spitzer Space Telescope observations ⓘ |
| isUsedAs |
benchmark for interstellar chemistry models
ⓘ
benchmark for photon-dominated region models ⓘ template photodissociation region ⓘ |
| locatedIn |
Orion Molecular Cloud Complex
NERFINISHED
ⓘ
Orion Nebula NERFINISHED ⓘ |
| locatedInConstellation | Orion NERFINISHED ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ submillimeter wavelengths ⓘ ultraviolet wavelengths ⓘ |
| shapedBy | ultraviolet radiation ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.