THE discovery of galactic X-rays by Giacconi et al.1, confirmed by Friedman et al.2, which was quite unexpected from our present understanding of physical processes in astronomical objects, has induced a variety of theoretical investigations3. Among various mechanisms so far proposed to explain the X-ray sources, the neutron-star hypothesis suggested by several authors4 seems to present a reasonable combination of the radiative power, the distance, the life and the frequency of occurrence of the X-ray sources although the existence of neutron stars is still open to question.
Giacconi, R., Gursky, H., Paolini, F., and Rossi, B., Phys. Rev. Letters., 9, 439 (1962). Gursky, G., Giacconi, R., Paolini, F., and Rossi, B., Phys. Rev. Letters, 11, 530 (1963).
Bowyer, S., Byram, E. T., Chubb, T. A., and Friedman, H., Nature, 201, 1307 (1964).
See ref. 1 and also a review article by Hayakawa, S., and Matsuoka, M., Prog. Theor. Phys. (to be published).
Chiu, H. Y., Ann. Phys., 26, 364 (1964). Hayakawa, S., and Matsuoka, M., Jaipur Conf. Cosmic Rays (Dec. 1963). Morton, D. C., Nature, 201, 1308 (1964). Chiu, H. Y., and Salpeter, E. E., Phys. Rev. Letters, 12, 413 (1964).
Woltjer, L., B.A.N., 14, 39 (1958).
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ODA, M. The Neutron-star Hypothesis of Celestial X-ray Sources. Nature 202, 1321 (1964). https://doi.org/10.1038/2021321a0
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