Maarten Schmidt

Maarten Schmidt (28 December 1929 – 17 September 2022) was a Dutch-born American astronomer who first measured the distances of quasars. He was the first astronomer to identify a quasar, and so was pictured on the March cover of Time magazine in 1966.

Early life

Schmidt was born in Groningen, The Netherlands,<ref name="JSTOR">Template:Cite journal</ref> on 28 December 1929.<ref name="NYT obit">Template:Cite news</ref> His father, Wilhelm, worked as an accountant for the Dutch government; his mother, Annie Wilhelmina (Haringhuizen), was a housewife. Schmidt studied math and physics at the University of Groningen, graduating with a bachelor's degree in 1949 before obtaining a master's degree the following year. He then commenced doctoral studies at Leiden University under Jan Oort. Schmidt was awarded a Doctor of Philosophy from Leiden Observatory in 1956.<ref name="NYT obit"/>

Career

After completing his doctorate, Schmidt resided in the United States for two years on a Carnegie Fellowship. He returned briefly to the Netherlands, but ultimately emigrated to the US on a permanent basis in 1959 to work at the California Institute of Technology.<ref name="NYT obit"/> In the beginning, he worked on theories about the mass distribution and dynamics of galaxies. Of particular note from this period was his formulation of what has become known as the Schmidt law, which relates the density of interstellar gas to the rate of star formation occurring in that gas.<ref name='schmidt'>Template:Cite journal</ref><ref name="kenn98">Template:Cite journal</ref> He later began a study of the light spectra of radio sources. In 1963, using the 200-inch reflector telescope at the Palomar Observatory, Schmidt identified the visible object corresponding to one of these radio sources, known as 3C 273 and also studied its spectrum. While its star-like appearance suggested it was relatively nearby, the spectrum of 3C 273 proved to have what was at the time a high redshift of 0.158, showing that it lay far beyond the Milky Way, and thus possessed an extraordinarily high luminosity. Schmidt termed 3C 273 a "quasi-stellar" object or quasar; thousands have since been identified.<ref name="NYT obit"/>

Schmidt was featured on the cover of Time magazine in March 1966.<ref name="NYT obit"/> He was later a co-recipient, with Donald Lynden-Bell, of the inaugural Kavli Prize for Astrophysics in 2008.<ref name='kavli'>Template:Cite web</ref>

He lectured a total of 33 times at the Summer Science Program. <ref>Template:Cite web</ref>

Personal life

Schmidt married Cornelia Tom in 1955. They met at a party hosted by Oort, and remained married until her death in 2020. Together, they had three daughters: Anne, Elizabeth, and Marijke.<ref name="NYT obit"/>

Schmidt died on 17 September 2022 at his home in Fresno, California. He was 92 years old.<ref name="NYT obit"/><ref>Template:Cite news</ref>

Honors

Awards

• Helen B. Warner Prize (1964)<ref name="Caltech obit">Template:Cite news</ref>
• Front cover of Time 11 March 1966 <ref>Template:Cite magazine</ref>
• Member of the American Academy of Arts and Sciences (1969)<ref>Template:Cite web</ref>
• Henry Norris Russell Lectureship (1978)<ref name="Caltech obit"/>
• Member of the National Academy of Sciences (1978)<ref>Template:Cite web</ref>
• Gold Medal of the Royal Astronomical Society (1980)<ref name="Caltech obit"/>
• Golden Plate Award of the American Academy of Achievement (1980)<ref>Template:Cite web</ref>
• Correspondent of the Royal Netherlands Academy of Arts and Sciences (1980)<ref>Template:Cite web</ref>
• James Craig Watson Medal (1991)<ref name="Caltech obit"/>
• Bruce Medal (1992)<ref name="Caltech obit"/>
• Member of the German Academy of Sciences Leopoldina (1995)<ref>Template:Cite web</ref>
• Member of the American Philosophical Society (2000)<ref>Template:Cite web</ref>
• Kavli Prize for Astrophysics (2008)<ref name='kavli' />
• Member of the Norwegian Academy of Science and Letters.<ref>Template:Cite web</ref>

Named after him

• Asteroid 10430 Martschmidt<ref>Template:Cite web</ref>