Abstract
FOLLOWING the announcement of Gregory et al.1 and Hjellming and Balick2 that the radio source identified with Cyg X-3 had undergone a substantial increase in radio flux output some time between August 31, 1972, and September 2, 1972, we made a search through all data available for dates near this event from the Vela 5B spacecraft to determine if any associated increase in X-ray flux could be detected. Scans of the appropriate region of the sky were made on the four dates shown in Table 1. Cyg X-3 lies close enough on the sky to Cyg X-1 that the two sources were barely resolvable with the angular response of the X-ray detectors on the spacecraft; however, estimates of the strength of Cyg X-3 relative to Cyg X-1 were possible. In all cases, the flux observed from Cyg X-3 in the 3 to 12 keV energy range was consistent with the ratio of 1:3 (flux from Cyg X-3/flux from Cyg X-1) reported in previous observations of these sources (for example, Gursky et al.3).
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References
Gregory, P. C., Seaquist, E. R., Krpnberg, P. P., Hughes, V. A., Woodsworth, A., Viner, M. R., and Retallack, D., IAU Circ., 2440 (1972)
Hjellming, R. M., and Balick, B., IAU Circ, 2440 (1972).
Gursky, H., Gorenstein, P., and Giacconi, R., Astrophys. J. Lett., 150, L75 (1967).
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CONNER, J., EVANS, W. & MOOK, D. X-ray Observations of Cyg X-3 Near the Time of Radio Outbursts. Nature Physical Science 239, 125 (1972). https://doi.org/10.1038/physci239125a0
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DOI: https://doi.org/10.1038/physci239125a0
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