Wikipedia

Frederick D. Seward

Frederick D. Seward is an X-ray astronomer at the Smithsonian Astrophysical Observatory. He was one of the pioneers of X-ray astronomy, leading the Lawrence Livermore National Laboratory rocket program in the 1960s,[1][2] and is an expert on X-ray studies of supernova remnants.[3] He was awarded the 2024 George Van Biesbroeck Prize of the American Astronomical Society.[4]

Frederick D. Seward
Ph.D.
Seward in his office at the Center for Astrophysics in 2005
Born(1931-12-28)December 28, 1931
Goshen, New York, New York, USA
CitizenshipU.S.A.
Alma materPrinceton University,
University of Rochester
Known forX-ray astronomy, Supernova remnants
Scientific career
InstitutionsSmithsonian Astrophysical Observatory
Thesis (1958)

Early life and education

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Frederick Downing Seward was born in 1931. He is the great-great-grandson of Edwin Polydore Seward, brother of William H. Seward.[5]

Seward received a Bachelor of Science degree in physics from Princeton University in 1953. He went on to earn a PhD in experimental nuclear physics at the University of Rochester which he completed in 1958.[6][7]

Career

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After his PhD, Seward joined the Lawrence Livermore National Laboratory to work on linear accelerator experiments. As part of the Livermore group, he was involved in auroral X-ray radiation experiments on the Agena aft rack of several CORONA spy satellites – including Discoverer 29 and Discoverer 31.[8][9][10] Seward then participated in the 1962 atmospheric nuclear test series in the Pacific, Operation Dominic, and launched Nike-Apache sounding rockets from Johnston Island and Kauai to measure the radiation flux from the Starfish Prime high altitude nuclear explosion.[7]

 
F.D. Seward and colleagues holding a recoverable rocket payload, Kauai 1962.L-R: Seward, Pete Stoering, Orville Hine, Charles Curry, Max McGee, Cal Gardner

After the 1963 Partial Nuclear Test Ban Treaty, the Livermore team was tasked with maintaining the nation's ability to perform nuclear tests should the treaty lapse. The rockets and X-ray detectors used to measure the flux of artificial nuclear explosions were repurposed to study cosmic X-rays.[7] Seward led a research program to study extrasolar X-ray sources using sounding rockets provided by the Sandia National Laboratories, and pioneered the use of sounding rockets launched from flotation rafts in the ocean in order to study the South Atlantic Anomaly.[11]

Seward showed that the X-ray emission from the binary source Sco X-1 was thermal in nature,[12] and discovered several bright X-ray sources in the southern sky.[13][14][15] He designed detectors which operated in the soft (below 1 keV) X-ray energy band and showed that old supernova remnants emitted copiously in that energy band.[16]

In 1977 Seward moved to the Smithsonian Astrophysical Observatory to join the HEAO-B project, renamed the Einstein Observatory after its launch in 1978. Prior to Einstein, an astronomy satellite's data was reserved for the use of the developers of the satellite's instruments. With the new satellite (along with the International Ultraviolet Explorer mission which introduced the practice around the same time) any astronomer in the world could apply for observing time. Seward led the user support team and established the policies for supporting such external observers that have served as the template for subsequent missions.[17] Seward played a similar role in setting up user support for the Chandra X-ray Observatory.[18]

During the 1980s and 1990s Seward continued observing supernova remnants with the Einstein and ROSAT satellites, and discovered the remnant G13.3-1.3, as well as writing a textbook on X-ray astronomy.[19]

Seward formally retired in 2005 but as of 2024 continued to carry out active research on X-ray supernova remnants.[20] In 2024 he was awarded the biennial George Van Biesbroeck Prize, "For the establishment and implementation of the first open, peer-reviewed Guest Observer program for a Principal-Investigator-led NASA space-based observatory"[21]

Selected Publications

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  • Seward, Fred; Charles, Phil (1995). Exploring the X-ray Universe. Cambridge, UK: Cambridge University Press. ISBN 0521437121.
  • Seward, F.D.; Page, C.G.; Turner, M.J.L.; Pounds, K.A. (May 1976). "X-ray sources in the Aquila-Serpens-Scutum region". MNRAS. 175: 39. Bibcode:1976MNRAS.175P..39S. doi:10.1093/mnras/175.1.39P. (Discovery of X-rays from SS433)
  • Seward, F.D.; Grindlay, J.; Seaquist, E.; Gilmore, W. (October 1980). "Diffuse X-ray emission from the jets of SS433". Nature. 287 (5785): 806–808. Bibcode:1980Natur.287..806S. doi:10.1038/287806a0.
  • Seward, Frederick (August 1990). "Einstein Observations of Galactic Supernova Remnants". Ap. J. Suppl. Ser. 73: 781. Bibcode:1990ApJS...73..781S. doi:10.1086/191489.

References

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  1. ^ Hirsch, Richard (1983). Glimpsing an Invisible Universe. Cambridge University Press. p. 70. ISBN 0-521-31232-9.
  2. ^ Tucker, Wallace; Giacconi, Riccardo (1985). The X-ray Universe. Harvard University Press. p. 47. ISBN 0-674-96285-0.
  3. ^ Seward, Frederick; Gorenstein, Paul; Tucker, Wallace (August 1985). "Young Supernova Remnants". Scientific American. Scientific American, Inc. p. 88.
  4. ^ "CfA Astronomer Receives AAS Prize for Extraordinary Service". January 2024.
  5. ^ Seward, Frederick Whittlesey (1949). Obadiah Seward of Long Island, New York and his descendants. Goshen, NY: Privately published.
  6. ^ Seward, Frederick (1958). "Inelastic Scattering of Protons by Magnesium, Chromium and Other Elements From 3.5 To 7 MeV" (Ph.D. thesis). University of Rochester.
  7. ^ a b c McDowell, Jonathan (October 2023). "Oral history intervew - Fred Seward".
  8. ^ Richter, Henry (1966). Space Measurement Survey: Instruments and Spacecraft, October 1957-March 1965. NASA.
  9. ^ "Discoverer 36" (Press release). US Air Force. December 16, 1961.
  10. ^ McDowell, Jonathan (2007). "The VELA HOTEL piggyback panels on 1961 CORONA flights".
  11. ^ McCord,J (October 29, 1964). Hydra-Iris South Atlantic Program, UCRL-ID-124800 (Report). Lawrence Livermore National Laboratory.
  12. ^ Toor, A.; Palmieri, T.M.; Seward, F.D. (July 1976). "Evidence for thermal X-rays from the Crab Nebula". Ap.J. 207: 96. Bibcode:1976ApJ...207...96T. doi:10.1086/154471.
  13. ^ Grader, R.J.; Hill, R.W.; Seward, F.D. (1968). "Soft x-rays from a new source in the constellation Vela". Astronomical Journal. 73: 179. Bibcode:1968AJS....73R.179G.
  14. ^ MacGregor, A.; Seward, F.; Turiel, I. (September 1970). "Observation of Galactic X-Ray Sources 1968 November 3". Astrophysical Journal. 161: 979. Bibcode:1970ApJ...161..979M. doi:10.1086/150598.
  15. ^ Hill, R.W.; Burginyon, G.A.; Seward, F.D. (1975). "A soft X-ray survey of the Scutum-Serpens-Aquila region". Astrophysical Journal. 200: 163. Bibcode:1975ApJ...200..709H. doi:10.1086/153841.
  16. ^ Hill, R.W.; Burginyon, G.A.; Seward, F.D. (1975). "The Soft X-Ray Spectra of Cassiopeia a and Tycho's Supernova Remnant". Ap.J. 200: 158. Bibcode:1975ApJ...200..158H. doi:10.1086/153772.
  17. ^ Tucker, Wallace; Giacconi, Riccardo. The X-ray Universe. Harvard University Press. p. 139.
  18. ^ "User Support Leader Steps Down". Chandra X-ray Center. March 2005.
  19. ^ Charles, Philip A.; Seward, Frederick D. (1995). Exploring the X-ray Universe (1. publ ed.). Cambridge: Cambridge Univ. Press. ISBN 978-0-521-43712-7.
  20. ^ "At 92, award-winning Concord astrophysicist still searching the cosmos". The Concord Bridge. May 2024.
  21. ^ "George Van Biesbroeck Prize". American Astronomical Society. May 6, 2024. Retrieved November 6, 2024.
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