Observations of Cyg X-1 from Aryabhata

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


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.

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