Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
astronomer
|
| gptkbp:alsoKnownAs |
gptkb:21-centimeter_line
hydrogen line |
| gptkbp:animationType |
spin-flip transition
|
| gptkbp:causedBy |
hyperfine transition
|
| gptkbp:discoveredBy |
gptkb:Harold_Ewen
gptkb:Edward_Purcell |
| gptkbp:discoveredIn |
1951
|
| gptkbp:electromagneticSpectrumRegion |
gptkb:radio_waves
|
| gptkbp:emits |
neutral hydrogen atom
|
| gptkbp:frequency |
1420.40575177 MHz
|
| https://www.w3.org/2000/01/rdf-schema#label |
HI line
|
| gptkbp:importantFor |
gptkb:cosmology
astrophysics |
| gptkbp:transitionEnergy |
5.87433 μeV
|
| gptkbp:usedFor |
mapping galactic structure
studying interstellar medium detecting hydrogen in galaxies measuring galactic rotation curves |
| gptkbp:usedIn |
radio astronomy
|
| gptkbp:wavelengthRange |
21 centimeters
|
| gptkbp:bfsParent |
gptkb:21_cm_line
|
| gptkbp:bfsLayer |
6
|