AXAF


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AXAF

The Advanced X-ray Astrophysics Facility, originally intended by NASA to follow the Hubble Space Telescope as a long-lived X-ray observatory for the 1990s, with in-orbit servicing from the space shuttle. A direct successor to the Einstein Observatory, AXAF was to carry an array of large (1.2-meter outer diameter) coaxial grazing incidence mirrors in a nested configuration, high-resolution cameras using both CCDs and microchannel plates, and a cryogenically cooled X-ray spectrometer. Budgetary constraints led in 1992 to the restructuring of the AXAF into two smaller missions, AXAF-I (concerned with high-resolution X-ray imaging) and AXAF-S (dealing with X-ray spectroscopy). AXAF-I was scheduled for launch in 1998/99 into a highly eccentric orbit that would keep it out of the Earth's shadow for long periods, thereby maximizing its observation time. AXAF-S was to follow it into space in 1999, traveling in a near-Earth Sun-synchronous orbit to conduct high-resolution X-ray spectroscopy with no in-orbit servicing. In the event, NASA canceled AXAF-S, and its advanced X-ray spectroscopic instruments were transferred to the ill-fated Japanese Astro-E mission (see Astro-E2). Development of AXAF-I continued, however, and it was eventually successfully launched in July 1999 and renamed Chandra (see Chandra X-ray Observatory).
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
Closer to home the Virgo Cluster, the nearby galaxies M51 and M33, and the Andromeda Galaxy are all targets for AXAF's X-ray eyes.
AXAF carries two main cameras, the AXAF CCD Imaging Spectrometer (ACIS), which has 10 chargecoupled devices (CCDs) akin to the chips used in camcorders, and the High Resolution Camera (HRC), which has microchannel-plate detectors developed specially for X-ray astronomy.
CRAF/Cassini and AXAF top the priority lists in two separate divisions of NASA's space science office -- Planetary Exploration and Astrophysics -- and they are just two the numerous projects in the plan, all of which already have won endorsement by various NASA advisory bodies and other organizations.
ING (NYSE: ING) (INGA.AS) and AXA (AXAF.PA) (EPA: CS) have said that they have entered into an exclusive, long term, multi-country bancassurance partnership to provide insurance products and related services through a central digital insurance platform.
A physicist at the Harvard-Smithsonian Center for Astrophysics, MARTIN ZOMBECK is Project Scientist for the High Resolution Camera on NASA's Advanced X-ray Astrophysics Facility (AXAF), due to be launched in August 1998.
Insurer, Axa (AXAF.PA), is to purchase XL Group in a mega insurance deal.
The servicing mission to install new instruments on the Hubble Space Telescope later this year, the planned launch of the AXAF X-ray satellite in 1998, and the growth of millimeter- and submillimeter-wave astronomy should all continue to provide exciting new views of clusters across the spectrum.
AXA Equitable Life Insurance Company (AXAF.PA) (EPA: CS), a financial protection company, has said that it has appointed Jeffrey J.
AXA SA (AXAF.PA) (EPA: CS) (OTC: AXAHY), a global insurance company based in France, has planning an initial public offering for its U.S.
AXA (AXAF.PA) (EPA: CS) has said that it has appointed Kevin Molloy as head of Investor Relations (IR) for AXA US and Stephen Scanlon as head of Retirement Plan Services (RPS).
BNP Paribas SA (BNPP.PA) is said to be exploring a fund-management tie-up with Axa SA's (AXAF.PA) European asset-management unit.
In 2007, Bidet joined Societe Generale (SocGen) (SOGN.PA) (OTC: SCGLY) (GLE.FR) AXA (AXAF.PA) (EPA: CS), where she developed the Rating Advisory activity for banks.