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A high sensitivity determination of the hard X-ray spectrum of Sco X-1The results of hard X-ray observations of Sco X-1 by HEAO 1 and OSO 7 are reported. The X-ray spectrum between 20 and 70 keV was found consistent with thermal bremsstrahlung from a hot plasma at a temperature of 5.15 plus or minus 0.05 keV. Observations with the instruments of HEAO 1 on Sept. 6-7, 1978, and with those of OSO 7 during 1972, have not confirmed reports that the bremsstrahlung spectrum is accompanied by an extra component at energies greater than 40 keV - the reported observations yield a two-standard deviation upper limit to the flux in this region of 6.4 x 10 to the -6th photons/sq cm/s/keV.
Document ID
19800063623
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rothschild, R. E.
(California Univ. La Jolla, CA, United States)
Gruber, D. E.
(California Univ. La Jolla, CA, United States)
Knight, F. K.
(California Univ. La Jolla, CA, United States)
Nolan, P. L.
(California Univ. La Jolla, CA, United States)
Soong, Y.
(California, University La Jolla, Calif., United States)
Levine, A. M.
(California Univ. La Jolla, CA, United States)
Primini, F. A.
(California Univ. La Jolla, CA, United States)
Lewin, W. H. G.
(MIT Cambridge, Mass., United States)
Wheaton, W. A.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, Calif.; MIT, Cambridge Mass., United States)
Date Acquired
August 10, 2013
Publication Date
August 21, 1980
Publication Information
Publication: Nature
Volume: 286
Subject Category
Astrophysics
Accession Number
80A47793
Funding Number(s)
CONTRACT_GRANT: NAS8-27974
Distribution Limits
Public
Copyright
Other

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