Hendrik Christoffel van of Hulst
Hendrik Christoffel van of Hulst (November 19th 1918 - July 31st 2000) was a Astronome Dutch.
In 1944, whereas it is still student with the service of Jan Oort with the Observatoire of Leyde (Leyde, Netherlands), it predicts the existence of a emission line of 21,1 cm Wavelength (that is to say 1420,4 MHz), corresponding to the presence of atomic Hydrogène in the interstellar Milieu. This radiation will be observed for the first time in 1951 by Edward Purcell and Harold Ewen.
Since, this discovery became an extremely important element of astronomical research: since it is not affected by the presence of dust, the measurement of this radiation made it possible to chart the distribution of hydrogen in the Milky Way, as in others Galaxie S as the Radiotélescope S became more powerful. This measurement as that of the Doppler effect related to the emission line led to the assumption that the Milky Way is a barred Spiral galaxy.
Hendrik van of Hulst passed most of its career to the Université of Leyde.
It received the Médaille Henry Draper, as well as the Médaille Eddington in 1955, the Médaille Rumford in 1964 and the Médaille Bruce in 1978.
June 20th 1991 -->
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