Bradley M. Peterson
Space Telescope Science Institute
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Featured researches published by Bradley M. Peterson.
The Astrophysical Journal | 1991
K. Horne; William F. Welsh; Bradley M. Peterson
A one-dimensional echo map of the broad H-beta emission-line region in the Seyfert 1 galaxy NGC 5548 is reconstructed by using a maximum entropy technique to model the variable optical continuum and integrated H-beta emission-line fluxes observed during the 1989-1990 monitoring campaign as reported by Peterson et al. (1991). The echo map has a strong peak at a time delay of 20 lt-days which has an unresolved full width of 20 days at half-maximum. The H-beta response at time delay zero is less than one-third of that at 20 days, implying a deficit of H-beta-emitting gas near the line of sight to the continuum source. This rules out spherically symmetric and edge-on disk geometries for isotropically emitting H-beta clouds. 7 refs.
UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII | 2017
Harley Thronson; Bradley M. Peterson; Matthew A. Greenhouse; Howard A. MacEwen; Rudranarayan Mukherjee; Ronald S. Polidan; Benjamin B. Reed; Nicholas Siegler; Hsiao Smith
Some concepts for candidate future “flagship” space observatories approach the payload limits of the largest launch vehicles planned for the next few decades, specifically in the available volume in the vehicle fairing. This indicates that an alternative to autonomous self-deployment similar to that of the James Webb Space Telescope will eventually be required. Moreover, even before this size limit is reached, there will be significant motivation to service, repair, and upgrade in-space missions of all sizes, whether to extend the life of expensive facilities or to replace outworn or obsolete onboard systems as was demonstrated so effectively by the Hubble Space Telescope program. In parallel with these challenges to future major space astronomy missions, the capabilities of in-space robotic systems and the goals for human space flight in the 2020s and 2030s offer opportunities for achieving the most exciting science goals of the early 21st Century. In this paper, we summarize the history of concepts for human operations beyond the immediate vicinity of the Earth, the importance of very large apertures for scientific discovery, and current capabilities and future developments in robot- and astronaut-enabled servicing and assembly.
Archive | 2001
Laura Ferrarese; Bradley M. Peterson; Richard W. Pogge; David Merritt; Amri Wandel
2018 AIAA SPACE and Astronautics Forum and Exposition | 2018
Harley Thronson; Nicholas Siegler; Matthew A. Greenhouse; John Grunsfeld; Howard A. MacEwen; Bradley M. Peterson; Ronald S. Polidan
Archive | 2015
M. Berton; Luigi Foschini; Stefano Ciroi; V. Cracco; Giovanni La Mura; M. L. Lister; Smita Mathur; Bradley M. Peterson; J. L. Richards; Piero Rafanelli
Archive | 2012
Gerard A. Kriss; Nahum Arav; Anton Koekemoer; Smita Mathur; Bradley M. Peterson; Jennifer E. Scott
Archive | 2010
Bradley M. Peterson; C. J. Grier; Misty C. Bentz; Kalliopi M. Dasyra; Laura Ferrarese; Paul Martini; Richard W. Pogge; Linda J. Tacconi; Linda C. Watson
Archive | 2008
Bradley M. Peterson; Kalliopi M. Dasyra; Laura Ferrarese; Paul Martini; Richard W. Pogge; Linda J. Tacconi; Linda C. Watson
Archive | 2006
Misty C. Bentz; Bradley M. Peterson; Richard W. Pogge
Archive | 2003
Shai Kaspi; Ari Laor; Louis-Benoit Desroches; Alexei V. Filippenko; Bradley M. Peterson; Dan Maoz; Yuzuru Yoshii; Takeo Minezaki