Abstract
IN a recent sounding rocket flight in the southern hemisphere (launched from Woomera, South Australia, on November 11, 1970) the X-ray source Cygnus X1 was observed by a 1,000 cm2 collimated proportional counter sensitive to X-rays in the range 2–14 keV. Each X-ray event was indicated through the telemetry link by a 300 µs analogue pulse whose height was proportional to the incoming photon energy. This method of data transmission allows good timing accuracy together with a reasonable spectral resolution.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Boldt, E. A., Holt, S. F., and Serlemitsos, P. J., Astrophys. J. Lett., 164, L9 (1971).
Manchada, R. K., Iyengar, V. S., Agrawal, P. C., Gokhale, G. S., Kunte, P. K., and Sreekantan, B. V., Nature Physical Science, 232, 190 (1971).
Holt, S. F., Boldt, E. A., Schwartz, D. A., Serlemitsos, P. J., and Bleach, R. D., Astrophys. J. Lett., 166, L65 (1971).
Oda, M., Gorenstein, P., Gursky, H., Kellogg, E., Schreier, E., Tananbaum, H., and Giacconi, R., Astrophys. J. Lett., 166, L1 (1971).
Gursky, H., Gorenstein, P., Kerr, S. J., and Grayzeck, E. J., Astrophys. J. Lett., 167, L15 (1971).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
CRUISE, A., NEWTON, A. & CHAPMAN, C. Short Term Variability of Pulsations in the X-ray Flux from Cygnus X1. Nature 233, 468–469 (1971). https://doi.org/10.1038/233468a0
Received:
Issue Date:
DOI: https://doi.org/10.1038/233468a0
- Springer Nature Limited
This article is cited by
-
Celestial binary X-ray sources
Space Science Reviews (1976)
-
X-ray sources in binary systems
Die Naturwissenschaften (1973)