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Support of selected X-ray studies to be performed using data from the Uhuru (SAS-A) satelliteA new measurement of the diffuse X-ray emission sets more stringent upper limits on the fluctuations of the background and on the number counts of X-ray sources with absolute value of b 20 deg than previous measurements. A random sample of background data from the Uhuru satellite gives a relative fluctuation in excess of statistics of 2.0% between 2.4 and 6.9 keV. The hypothesis that the relative fluctuation exceeds 2.9% can be rejected at the 90% confidence level. No discernable energy dependence is evident in the fluctuations in the pulse height data, when separated into three energy channels of nearly equal width from 1.8 to 10.0 keV. The probability distribution of fluctuations was convolved with the photon noise and cosmic ray background deviation (obtained from the earth-viewing data) to yield the differential source count distribution for high latitude sources. Results imply that a maximum of 160 sources could be between 1.7 and 5.1 x 10 to the -11 power ergs/sq cm/sec (1-3 Uhuru counts).
Document ID
19760007923
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Garmire, G. P. (California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 3, 2013
Publication Date
January 8, 1976
Subject Category
Space Radiation
Report/Patent Number
NASA-CR-145835
Accession Number
76N15011
Funding Number(s)
CONTRACT_GRANT: NGR-05-002-296
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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