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

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Abstract

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 aspect1 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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Authors and Affiliations

  1. Physical Research Laboratory, Ahmedabad, 9

    U. R. RAO, E. V. CHITNIS, D. P. SHARMA, A. S. PRAKASARAO & U. B. JAYANTHI

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  1. U. R. RAO
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  2. E. V. CHITNIS
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  3. D. P. SHARMA
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  4. A. S. PRAKASARAO
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  5. U. B. JAYANTHI
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RAO, U., CHITNIS, E., SHARMA, D. et al. X-ray Observation of Cen XR-4 and Nor XR-2. Nature 229, 248–250 (1971). https://doi.org/10.1038/229248b0

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  • DOI: https://doi.org/10.1038/229248b0

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