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.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Miyamoto, C. & Matsuoka, M. Space Sci. Rev. 20, 687–755 (1977).
Agrawal, P.C. et al. Astrophys. Space Sci. 10, 500–507 (1971).
Matteson, J. L. Proc. AIAA 16th Aerospace Sci. Meet. Huntsville, Alabama, paper 78–35 (1978).
Lamb, P. & Sanford, P. W. Mon. Not. R. astr. Soc. 188, 555–563 (1979).
Rothschild, R. E., Baity, W. A., Mushotzky, R. F., Wheaton, W. A. & Peterson, L. E. (COSPAR) X-Ray Astronomy (eds Baity, W.A. & Peterson, L.E.) 369–372 (Pergamon, Oxford, 1979).
Haymes, R. C., Harnden, Jr, F. R., Johnson, III, W. N. & Prichard, H.M. Astrophys. J. Lett. 172, L47–49 (1972).
Riegler, G. R., Boldt, E. & Serlemitsos, P. Nature 226, 1041–1043 (1970).
Peterson, L. E. & Jacobson, A. S. Astrophys. J. 145, 962–965 (1966).
Greenhill, J. G., Coe, M. J., Bell-Burnell, S.J., Strong, K. T. & Carpenter, G.F. Mon. Not. R. astr. Soc. 189, 563–570 (1979).
Shakura, N.I. Soviet Astr. 16, 756–762 (1973).
Pringle, J. E. & Rees, M.J. Astr. Astrophys. 21, 1–9 (1972).
Kylafis, N. D. & Lamb, D. Q. Astrophys. J. Lett. 228, L105–110 (1979).
Bahcall, J. N. Physics and Astrophysics of Neutron Stars and Black Holes (eds Giacconi, R. and Ruffini, R.) 63–110 (North-Holland, Amsterdam, 1978).
Kylafis, N. D. thesis, Univ. Illinois (1978).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rothschild, R., Gruber, D., Knight, F. et al. A high sensitivity determination of the hard X-ray spectrum of Sco X-1. Nature 286, 786–788 (1980). https://doi.org/10.1038/286786a0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1038/286786a0
This article is cited by
-
Hard X-Ray/Soft Gamma-Ray Experiments and Missions: Overview and Prospects
Space Science Reviews (2017)
-
Ariel VI observations of Sco X-1
Space Science Reviews (1981)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.
