X-ray observation of Cen XR-4 and Nor XR-2

Rao, U. R. ; Chitnis, E. V. ; Sharma, D. P. ; Prakasarao, A. S. ; Jayanthi, U. B. (1971) X-ray observation of Cen XR-4 and Nor XR-2 Nature, 229 (5282). pp. 248-250. ISSN 0028-0836

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Official URL: http://www.nature.com/nature/journal/v229/n5282/ab...

Related URL: http://dx.doi.org/10.1038/229248b0


We wish to present the results of an X-ray astronomy experiment conducted from a Centaure rocket launched from Thumba Equatorial Rocket Launching Station (TERLS), India, at 0035 UT on December 7, 1969. The detector consisted of a xenon-methane proportional counter of useful area of 55 cm2 with a 18 mg cm-2 thick beryllium window and a slat collimator with a field of view of 7°×15°. It had a resolution of 20% for 6 keV X-rays from a 55Fe radioactive source. The rocket aspect determined from onboard magnetic and Sun sensors showed that it had a spin rate of 5. 5 r. p. s. and a precession with a half cone angle of about 3° around an axis centred at R. A. 8 h 56 m ±4 m and declination 3°±1°. The X-ray data were pulse height analysed into three contiguous energy channels in the energy range 2-18 keV.

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