NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Galactic Absorption Experiment (GAE)

NSSDCA ID: 1975-037A-04

Mission Name: SAS-C
Principal Investigator:Dr. George W. Clark


The density and distribution of interstellar matter was determined by measuring the variation in the intensity of the low-energy diffuse X-ray background as a function of galactic latitude. A 1-micrometer polypropylene window proportional counter was used for the 0.1- to 0.4-keV and 0.4- to 1.0-keV energy ranges, while a 2-micrometer titanium window counter covered the energy range from 0.3 to 0.5 keV. In addition, two 1-mm beryllium window counters were used for the 1.0- to 10-keV energy range. The collimators in this experiment had fields of view of 3 deg for the 1-micrometer counter, 2 deg for the 2-micrometer counter, and 2 deg for the 1-mm counters. For additional information, see D. R. Hearn et al., Ap. J., v. 203, p. L21, 1976.

Alternate Names

  • GAE

Facts in Brief

Mass: 75.3 kg
Power (avg): 17.5 W

Funding Agency

  • NASA-Office of Space Science (United States)


  • Astronomy: X-Ray

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Robert W. RascheGeneral ContactMassachusetts Institute of
Dr. Hale V. BradtOther InvestigatorMassachusetts Institute of
Dr. Walter H. G. LewinOther InvestigatorMassachusetts Institute of
Dr. Herbert W. SchnopperOther InvestigatorDanish Space Research Institute
Dr. George W. ClarkPrincipal InvestigatorMassachusetts Institute of
[] NASA Logo -