What is recorded here?
Ewen and Purcell observed radio emission from neutral hydrogen in the Milky Way near the 21-centimetre wavelength. Their 1951 report describes a signal concentrated near the Galactic plane, with a measurable frequency shift consistent with relative motion. The result gave radio astronomers a way to study hydrogen beyond regions visible in ordinary light.
Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.
Scientific scope
The result concerns the reported fixed-beam observations and their frequency calibration. Dutch and Australian observations were separate follow-up reports. Inferring Galactic structure from the line requires additional observations and a model of gas motion.
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People and systems
H. I. Ewen; E. M. Purcell
These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
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English catalogue narrative
Ewen and Purcell detect galactic hydrogen at the 21-centimeter line
Ewen and Purcell observed radio emission from neutral hydrogen in the Milky Way near the 21-centimetre wavelength. Their 1951 report describes a signal concentrated near the Galactic plane, with a measurable frequency shift consistent with relative motion. The result gave radio astronomers a way to study hydrogen beyond regions visible in ordinary light.
Scientific scope
The result concerns the reported fixed-beam observations and their frequency calibration. Dutch and Australian observations were separate follow-up reports. Inferring Galactic structure from the line requires additional observations and a model of gas motion.
Reading status
This is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.
People and systems
H. I. Ewen; E. M. Purcell
These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.