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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References
Rao, U. R., Chitnis, E. V., Prakasarao, A. S., and Jayanthi, U. B., Proc. Ind. Acad. Sci., 70 A, 257 (1969).
Friedman, H., Byram, E. T., and Chubb, T. A., Science, 156, 374 (1967).
Conner, J. P., Evans, W. D., and Belian, R. D., Astrophys. J. Lett., 157, L157 (1969).
Chodil, G., Mark, H., Rodrigues, R., Seward, F., Swift, C. D., Hiltner, W. A., Wallerstein, G., and Mannery, E. D., Phys. Rev. Lett., 19, 681 (1968).
Kitamura, T., Matsuoka, M., Miyamoto, S., Nakagawa, M., Oda, M., Ogawara, Y., and Takagishi, K., Nature, 224, 784 (1969).
Evans, W. D., Belian, R. D., and Conner, J. P., Astrophys. J. Lett., 159, L57 (1970).
Arp, H. C., Astron. J., 61, 15 (1956).
MacGregor, A., Seward, F., and Turiel, I., Astrophys. J. Lett., 161, 979 (1970).
Lewin, W. H. G., Clark, G. W., and Smith, W. B., Astrophys. J. Lett., 152, L49 (1968).
Manley, O. P., Astrophys. J., 144, 1253 (1966).
Poveda, A., and Woltjer, L., Astron. J., 73, 65 (1968).
Taylor, R., Astrophys. Lett., 3, 205 (1969).
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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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