Abstract
THE origin of the diffuse cosmic γ radiation has been widely discussed. It is either interpreted as the result of interactions in intergalactic space or as the result of the superposition of many unresolved external galaxies. Strong support for the latter hypothesis is given by our measurements of the energy spectrum of the Seyfert galaxy NGC4151 up to 10 MeV with the MPI Compton telescope1 which are reported here.
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
Graml, F., Penningsfeld, F. P. & Schönfelder, V. in Proc. ESA-Symp. Eur. Sounding Rocket, Balloon and Related Res. (in the press).
Schwartz, D. A. Astrophys. J. 162, 439–444 (1970).
Fabian, A. C. & Sanford, P. W. Nature phys. Sci. 231, 52–53 (1971).
Schönfelder, V., Graser, U. & Daugherty, J. Astrophys. J. 217, 306–319 (1977).
Fichtel, C. E. et al. Proc. ESA-Symp. Recent Advances in Gamma Ray Astronomy, ESA SP-124, 191–200 (1977).
Horstman, H. M., Cavallo, G. & Moretti-Horstman, E. Riv. Nuovo Cim. 5, 255–311 (1975).
Schönfelder, V. Fortschr. Phys. 23, 1–69 (1975).
Stecker, F. W. ESA SP-124, 201–206 (1977).
Stecker, F. W. Astrophys. J. 157, 507–514 (1969).
Stecker, F. W., Morgan, D. L. & Bredekamp, J. Phys. Rev. Lett. 27, 1469–1472 (1971).
Strong, A. W., Wolfendale, A. W. & Worrall, D. M. Mon. Not. R. astr. Soc. 175, 23–27 (1976).
Grindlay, J. E. Nature 273, 211 (1978).
Bignami, C. F., Lichti, G. G., Paul, J. A. Astr. Astrophys. (submitted).
Di Cocco, G. et al. Nature 270, 319–320 (1977).
Auriemma, G. et al. Astrophys. J. 221, L7–L11 (1978).
Elvis, M. et al. Mon. Not. R. astr. Soc. 183, 129–157 (1978).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
SCHÖNFELDER, V. Origin of MeV-excess in the energy spectrum of diffuse cosmic γ rays. Nature 274, 344–346 (1978). https://doi.org/10.1038/274344a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/274344a0
This article is cited by
-
The baryon-symmetric domain cosmology and the cosmic X-ray background
Astrophysics and Space Science (1987)
-
The contribution from active galactic nuclei to the diffuse 1 MeV background
Astrophysics and Space Science (1987)
-
The nature of the variability in the radiation of active nuclei of galaxies
Astrophysics (1985)
-
Relativistic electron-photon showers in the nuclei of active galaxies and quasars
Astrophysics (1984)
-
Active galaxies and the diffuse γ-ray background
Nature (1983)
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.
