Abstract
SOME twenty X-ray sources are now known, among them the well known objects M87 and the Crab nebula. Two X-ray sources (Sco X-1 and Cyg X-2) have been optically identified with previously unknown objects which have a stellar appearance and the characteristics of old novae1,2. Most X-ray sources remain unidentified, however. Most of them lie at low galactic latitudes, and it seems possible that many are objects similar to Sco X-1. These objects are not prominent at radio wavelengths and previous attempts to detect radio emission from Sco X-1, the strongest X-ray source, have yielded only upper limits to its flux density (refs. 3–5 and Hogg and Johnson quoted in ref. 6). The flux density of Sco X-1 has now been measured as 0.021 ± 0.007 flux units (1 flux unit = 10−26 W m−2 Hz−1) at a wavelength of 4.6 cm. This value is substantially below the previously determined upper limits.
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References
Sandage, A. R., Osmer, P., Giacconi, R., Gorenstein, P., Gursky, H., Waters, J., Bradt, H., Garmire, G., Sreekantan, B. V., Oda, M., Osawa, K., and Jugaku, J., Astrophys. J., 146, 316 (1966).
Giacconi, R., Gorenstein, P., Gursky, H., Usher, P. D., Waters, J. R., Sandage, A., Osmer, P., and Peach, P. V., Astrophys. J. Lett., 148, L129 (1967).
Johnson, H. M., Astrophys. J., 144, 635 (1966).
Hobbs, R. W., and Hollinger, J. P., Science, 155, 448 (1967).
Yokoi, H., Sato, T., and Morimota, M., Pub. Astro. Soc. Japan, 18, 185 (1966).
Heeschen, D. S., Astron. J., 72, 1118 (1967).
Peterson, L. E., and Jacobson, A. S., Astrophys. J., 145, 962 (1966).
Matthews, T. A., and Sandage, A. R., Astrophys. J., 138, 30 (1963).
Willstrop, R. V., Mon. Not. Roy. Astro. Soc., 121, 17 (1960).
Johnson, H. M., Astrophys. J., 146, 960 (1966).
Tucker, W., Astrophys. J. Lett., 149, L105 (1967).
Greene, J., Astrophys. J., 130, 693 (1959).
Manley, O. P., Astrophys. J., 144, 1253 (1966).
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ANDREW, B., PURTON, C. Detection of Radio Emission from Scorpio X-1. Nature 218, 855–856 (1968). https://doi.org/10.1038/218855a0
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DOI: https://doi.org/10.1038/218855a0
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