Rao, U. R. ; Kasturirangan, K. ; Sharma, D. P. ; Radha, M. S. (1976) Observations of Cyg X-1 from Aryabhata Nature, 260 . pp. 307-308. ISSN 0028-0836
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Official URL: http://www.nature.com/nature/journal/v260/n5549/ab...
Related URL: http://dx.doi.org/10.1038/260307a0
Abstract
Aryabhata, India's first artificial satellite, which was launched into a near circular orbit of 600 km altitude at an inclination of 51° on April 19, 1975, carried instruments to investigate celestial X rays in the energy range 2.5-155 keV. We report here observations of Cyg X-1 made in the range 2.5-18.75 keV, during the second orbit of the satellite, centred around 108 d 9 h 17 min 40 s UT, just before the source made a major increase in its intensity. We found a hardening in the spectrum.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Nature Publishing Group. |
| ID Code: | 16567 |
| Deposited On: | 15 Nov 2010 09:23 |
| Last Modified: | 04 Jun 2011 08:46 |
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