On the Advanced X-ray Astrophysics Facility Letter Report (1993) (1993) / Chapter Skim
Currently Skimming:
Report
Report
Pages 1-11
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 1... ...
, a joint panel of the Space Studies Board and the Board on Physics and Astronomy, finds that the restructured AXAF program-consisting of AXAF-I, to be launched into a high-Earth orbit in 1998, and AXAF-S, to be launched into a polar, low-Earth orbit in 1999-is fully capable of meeting the primary scientific goals of the former AXAF program. Although the need to reduce substantially the total cost of the program has led to shorter mission lifetimes, the expected increase in operating efficiency partly makes up for this shortfall.
|
From page 2... ...
Alexander, Assistant Associate Administrator for Space Sciences and Applications, to Louis J Lanzerotti, Chair of the Space Studies Board, NASA asked the National Research Council (NRC)
|
From page 3... ...
, the Committee on Space Astronomy and Astrophysics of the Space Science Board, in their document entitled A Strategy for Space Astronomy and Astrophysics for the 1980's (National Academy of Sciences, 1979) , envisioned and recommended "a semipermanent (several-decade)
|
From page 4... ...
However, because the costs associated with such a program are too high to sustain in the current budget environment, NASA and the AXAF Science Working Group have decided that a pair of limited-life missions is a preferable scenario for accomplishing the scientific goals of the AXAF program. The TGA endorses this view and believes that the revised AXAF program will satisfy the scientific expectations encompassed by previous NRC committee reports, even though it will not provide a permanent x-ray observatory in space.
|
From page 5... ...
This implies that iron lines, probably broadened fluorescence lines from circumnuclear material, are common emission features in AGN spectra, and that AXAF will therefore have the capability to measure redshifts of distant AGNs. A very recent result from the Broad-band X-ray Telescope (BBXRT)
|
From page 6... ...
The design lifetime of AXAF-I is five years, and the design lifetime of AXAF-S is three years. Since the technical aspects of the various instrument designs remain almost entirely unchanged, the scientific performance of the unified AXAF program is largely preserved.
|
From page 7... ...
References 1. Committee on Space Astronomy and Astrophysics, Space Science Board, A Strategy for Space Astronomy and Astrophysics for the 1980s, National Academy of Sciences, Washington, D.C., 1979.
|
From page 8... ...
Membership Lists Last update 9/5/00 at 9:40 am Site managed by Anne Simmons, Space Studies Board The National Academies Current Projects Publications Directories Search Site Map Feedback file:///C|/SSB_old_web/axaf93ltr.htm (8 of 8)
|
From page 9... ...
DAVIDSEN, Johns Hopkins University, Chair DAVID ARNETT, University of Arizona HALE BRADT, Massachusetts Institute of Technology ANNE P COWLEY, Arizona State University PAUL GORENSTEIN, Smithsonian Astrophysical Observatory STEVEN M
|
From page 10... ...
SHAPERO, Director SPACE STUDIES BOARD LOUIS J LANZEROTTI, AT&T Bell Laboratories, Chair JOSEPH A
|
From page 11... ...
WALKER, JR., Stanford University MARC S ALLEN, Director Return to Letter Last update 9/5/00 at 9:43 am Site managed by Anne Simmons, Space Studies Board The National Academies Current Projects Publications Directories Search Site Map Feedback file:///C|/SSB_old_web/axaf93mem.htm (3 of 3)
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.