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A high sensitivity determination of the hard X-ray spectrum of Sco X-1

Nature volume 286, pages 786788 (21 August 1980) | Download Citation

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Abstract

The results of hard X-ray observations of Sco X-1 by HEAO 1 and OSO 7 are reported here. We have found that the X-ray spectrum between 20 and 70 ke V is consistent with thermal bremsstrahlung from a hot plasma1 at a temperature of 5.15±0.05 ke V. Observations with the instruments of HEAO 1 on 6–7 September 1978, and with those of OSO 7 during 1972, have not confirmed reports2 that the bremsstrahlung spectrum is accompanied by an extra component at energies greater than 40 ke V—indeed, our observations yield a two-standard deviation upper limit to the flux in this region of 6.4×10−6 photons cm−2 s−1 ke V−1.

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Author information

Affiliations

  1. Center for Astrophysics and Space Sciences, University of California at San Diego, La Jolla, California 92093

    • R. E. Rothschild
    • , D. E. Gruber
    • , F. K. Knight
    • , P. L. Nolan
    •  & Y. Soong
  2. Department of Physics and Center for Space Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

    • A. M. Levine
    • , F. A. Primini
    • , W. A. Wheaton
    •  & W. H. G. Lewin
  3. Present address: Jet Propulsion Laboratory, Pasadena, California.

    • W. A. Wheaton

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https://doi.org/10.1038/286786a0

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