Abstract
WE have observed two separate and intense sources of cosmic X-rays in the region of the constellations Scorpius and Sagittarius during a rocket experiment launched on August 28, 1964. This is the same general region of the sky from which non-solar cosmic X-rays were first detected in June 1962 by Giacconi et al.1. In that earlier work a Geiger tube detector of large area and wide angular response was mounted, looking out of the side of a spinning rocket. A strong maximum in the counting rate was observed when the detector pointed in a southerly direction. A detailed discussion of the results led to the conclusion that the X-rays were of non-terrestrial origin, and that they emanated from a source close to, but apparently not coincident with, the galactic centre. These conclusions were confirmed in two later rocket flights, also employing wide-angle detectors2. In April 1963 Bowyer et al. conducted a rocket experiment using a detector with a field of view 10° wide at half maximum intensity3. At the time of that flight the galactic centre was below the horizon. They gave a location for the source in Scorpius at about 16 h 15 min right ascension and − 15° declination and stated that its angular diameter is less than 5°.
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References
Giacconi, R., Gursky, H., Paolini, F. R., and Rossi, B. B., Phys. Rev. Letters, 9, 439 (1962).
Gursky, H., Giacconi, R., Paolini, F. R., and Rossi, B. B., Phys. Rev. Letters, 11, 530 (1963).
Bowyer, S., Byram, E. T., Chubb, T. A., and Friedman, H., Nature, 201, 1307 (1964).
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GIACCONI, R., GURSKY, H., WATERS, J. et al. Two Sources of Cosmic X-rays in Scorpius and Sagittarius. Nature 204, 981–982 (1964). https://doi.org/10.1038/204981a0
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DOI: https://doi.org/10.1038/204981a0
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