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Michiel van der Klis
Michiel Baldur Maximiliaan van der Klis (born 9 June 1953) is a Dutch astronomer best known for his work on extreme 'pairings' of stars called X-ray binaries, more particularly his explanation of the occurrence of quasi-periodic oscillations (QPOs) in these systems and his discovery of the first millisecond X-ray pulsar. In the 1980s he gained world-wide fame with his investigation of QPOs. His revolutionary discoveries have had an enormous impact in his field of research; in effect, they have made it what it is today. Van der Klis pioneered special mathematical analysis techniques that are now regarded as the “gold standard” within his discipline.
==Research==
Van der Klis's research focuses on X-ray binaries, pairs of stars orbiting each other that emit X-ray radiation. Some binary star systems contain a compact object like a neutron star or a black hole. By studying the dynamics of materials in the vicinity of such objects one can learn about their mass, radius and rotational speed. Moreover, this kind of research provides a testing ground for cosmology and general relativity.
Van der Klis made a number of breakthrough discoveries. In 1984 he discovered the first type of QPOs (quasi-periodic oscillations of the X-ray emission) of compact stars while he was working with ESA’s EXOSAT satellite to study the strongest X-ray sources near the centre of the Milky Way. One of his achievements is the explanation in 1985 why X-rays emitted from binary systems do not come in steady pulses (like the radiowaves emitted by pulsars), but in short irregular bursts. His studies in the years 1984-1987 clarified the principles for classifying the several hundreds of strong X-ray sources known to exist in our Galaxy. In the 1990s, he and his research group discovered the first millisecond X-ray pulsar in a binary system, a neutron star spinning around its axis more than 400 times per second. The discovery of this superfast spinning neutron star attracted great international attention.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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