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| Scientist: Antony Hewish |
British radio astronomer (1924–
Hewish was born at Fowey in Cornwall, and studied at Cambridge University. He obtained his BA in 1948 and his PhD in 1952 after wartime work with the Royal Aircraft Establishment, Farnborough. He lectured in physics at Cambridge until in 1969 he was made reader and in 1971 professor of radio astronomy, becoming professor emeritus in 1989. In 1974 he was awarded the Nobel Prize for physics jointly with Martin
One of Hewish's research projects was the study of radio scintillation using the 4.5-acre telescope, which consisted of a regular array of 2048 dipoles operating at a wavelength of 3.7 meters. Radio scintillation is a phenomenon, similar to the twinkling of visible stars, arising from random deflections of radio waves by ionized gas. The three types of scintillation are caused by ionized gas in the interstellar medium, in the interplanetary medium, and in the Earth's atmosphere. All three types were discovered at Cambridge and Hewish was involved in their investigation. In 1967 a research student, Jocelyn Bell (later
To determine the nature of the signal, Hewish's first job was to eliminate such man-made sources as satellites, radar echoes, and the like. Measurements indicated that it must be well beyond the solar system. It seemed possible that it had been transmitted by an alien intelligence and the LGM (Little Green Men) hypothesis, as it became known, was seriously considered at Cambridge, but with the rapid discovery of three more pulsars it was soon dropped.
Hewish did however manage to establish some of the main properties of the pulsar from a careful analysis of its radio signal. Apart from its striking regularity (it was later shown to be slowing down very slightly) it was extremely small, no more than a few thousand kilometers, and was situated in our Galaxy.
By the end of February 1968 Hewish was ready to publish. His account received wide publicity in the popular press and stimulated much thought among astronomers as to the possible mechanism. The proposal made by Thomas Gold and others that pulsars were rapidly rotating neutron stars has since won acceptance.
| Wikipedia: Antony Hewish |
| Antony Hewish | |
|---|---|
| Born | 11 May 1924 (age 85) |
| Nationality | United Kingdom |
| Fields | Radio astronomy |
| Known for | Pulsars |
| Notable awards | Nobel Prize for Physics (1974) Eddington Medal of the Royal Astronomical Society in 1969 |
| Religious stance | Christian |
Antony Hewish (born Fowey, Cornwall, 11 May 1924) is a British radio astronomer who won the Nobel Prize for Physics in 1974 (together with fellow radio-astronomer Martin Ryle) for his work on the development of radio aperture synthesis and its role in the discovery of pulsars. (Jocelyn Bell Burnell, Hewish's graduate student, was not recognized, although she was the first to notice the stellar radio source that was later recognised as a pulsar.) He was also awarded the Eddington Medal of the Royal Astronomical Society in 1969.
His undergraduate degree at Gonville and Caius College, Cambridge was interrupted by war service at the Royal Aircraft Establishment, and at the Telecommunications Research Establishment where he worked with Martin Ryle. Returning to Cambridge in 1946, Hewish completed his degree and immediately joined Ryle's research team at the Cavendish Laboratory, obtaining his Ph.D. in 1952. Hewish made both practical and theoretical advances in the observation and exploitation of the apparent scintillations of radio sources due to their radiation impinging upon plasma.
This led him to propose, and secure funding for, the construction of the Interplanetary Scintillation Array, a large array radio telescope at the Mullard Radio Astronomy Observatory (MRAO), Cambridge in order to conduct a high time-resolution radio survey of interplanetary scintillation. In the course of this project, one of his graduate students, Jocelyn Bell, first noticed the radio source which was ultimately recognised as the first pulsar.
The paper announcing the discovery had five authors, Hewish's name being listed first, Bell's second. The Nobel award to Ryle and Hewish without the inclusion of Bell as a co-recipient was controversial, and was roundly condemned by Hewish's fellow astronomer Fred Hoyle. Others,[who?] however, have noted that the prize was given to Ryle and Hewish for their work across the field of radio-astronomy as a whole, with particular mention of Ryle's work on aperture-synthesis, and Hewish's on pulsars.
Hewish was professor of radio astronomy at the Cavendish Laboratory from 1971 to 1989, and head of the MRAO from 1982 to 1988. He was made a Fellow of the Royal Society in 1968, and he and Martin Ryle were awarded the Nobel Prize in Physics in 1974.
He developed an association with the Royal Institution in London when it was directed by Sir Lawrence Bragg, giving one of the Christmas Lectures and subsequently several Friday Evening Discourses[1] and was made a Professor of the Royal Institution in 1977[2][3]
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Hewish has Honorary degrees from 6 universities including Manchester, Exeter and Cambridge, is a Foreign Member of the Belgian Royal Academy and the American Academy of Arts and Sciences and the Indian National Science Academy. His prizes include[2]:
Hewish is a fellow of Churchill College, Cambridge.
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