Upper limits on pulsations from Cyg X-1 in hard X-rays

Manchanda, R. K. ; Iyengar, V. S. ; Agrawal, P. C. ; Gokhale, G. S. ; Kunte, P. K. ; Sreekantan, B. V. (1971) Upper limits on pulsations from Cyg X-1 in hard X-rays Nature, 232 . pp. 190-191. ISSN 0028-0836

Full text not available from this repository.

Official URL: http://www.nature.com/nature-physci/journal/v232/n...

Related URL: http://dx.doi.org/10.1038/physci232190a0


In an earlier communication1 we presented evidence for short term variations in the intensity of Cyg X-1 in the energy band 22.5-154 keV based on observations with a balloon-borne oriented X-ray telescope that monitored the intensity of this source between 0002 and 0315 UT on April 6, 1971. In the light of the findings of Oda et al. 2 and Holt et al. 3 about the possible presence of pulsating components in the X-ray emission of Cyg X-1 at energies of a few keV, we have analysed the data of April 6 to see whether similar pulsations are also present in the higher energy band. The instrumental details, the flight performance, the methods of recording, classification and analysis of data to obtain the contribution of Cyg X-1 to the counting rate of the telescope during the 3 h exposure are given in ref. 1.

Item Type:Article
Source:Copyright of this article belongs to Nature Publishing Group.
ID Code:87030
Deposited On:14 Mar 2012 07:59
Last Modified:04 Jul 2012 09:45

Repository Staff Only: item control page