SII
E491339
SII (singly ionized sulfur) is an emission line commonly used in astrophotography and spectroscopy to highlight ionized gas regions in nebulae and other astronomical objects.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| S II | 0 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
emission line
ⓘ
ion ⓘ singly ionized atom ⓘ spectral line ⓘ |
| belongsToSpectralRegion |
optical
ⓘ
red ⓘ |
| category |
astrophysical emission line
ⓘ
nebular line ⓘ |
| comparedWith |
Hα emission
ⓘ
[O III] emission ⓘ |
| diagnosticFor |
electron density in nebulae
ⓘ
photoionized gas ⓘ shock-excited gas ⓘ |
| emittedBy |
ionized interstellar medium
ⓘ
photoionized nebulae ⓘ shock fronts in supernova remnants ⓘ |
| hasApplication |
probing physical conditions in nebulae
ⓘ
separating shock-ionized from photoionized regions ⓘ studying star-forming regions ⓘ |
| hasAtomicNumberOfElement | 16 ⓘ |
| hasCharge | +1 ⓘ |
| hasChemicalSymbol | S ⓘ |
| hasCommonWavelength |
6716 Å
ⓘ
6731 Å ⓘ |
| hasElement | sulfur ⓘ |
| hasIonizationPotentialOfParentToThisState | 10.36 eV ⓘ |
| hasIonizationState | singly ionized ⓘ |
| hasSpectroscopicNotation | S II ⓘ |
| hasTransitionType | forbidden line ⓘ |
| mappedToColor | red in Hubble palette ⓘ |
| observedIn |
active star-forming galaxies
ⓘ
extragalactic H II regions ⓘ galactic nebulae ⓘ |
| relatedTo |
interstellar medium diagnostics
ⓘ
sulfur abundance measurements ⓘ |
| traces |
ionized gas
ⓘ
nebular gas ⓘ |
| usedIn |
astronomical spectroscopy
ⓘ
astrophotography ⓘ |
| usedInColorMappingScheme | Hubble palette NERFINISHED ⓘ |
| usedInImagingFilter | S II narrowband filter ⓘ |
| usedInImagingTechnique | narrowband imaging ⓘ |
| usedToHighlight |
H II regions
ⓘ
ionized gas regions ⓘ nebulae ⓘ planetary nebulae ⓘ supernova remnants ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.