Abstract
ON nine separate occasions between October 27, 1971, and January 6, 1973, the MIT instrument aboard OSO-7 scanned the region of sky within about 10° of the galactic centre. Subsequent analysis of this data, in the form of all-sky maps, led to the discovery of several previously unreported X-ray sources1. The most intense of these, MX1746–20, was found at α = 17 h 46.0 min.δ = −20° 22.2′ (1950.0) or, in galactic coordinates lII = 7.73°, bII = 3.76°. The 90% confidence contour for this position is a circle of radius approximately 0.26°. This uncertainty includes an estimate of the probable aspect error as well as statistical uncertainty.
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References
Markert, T. H., et al., IAU Circ., No. 2765 (1975).
Clark, G. W., et al., Astrophys. J., 179, 263 (1973).
Clark, G. W., Markert, T. H., and Li, F.-K., Astrophys. J. Lett. (in the press).
Arp, H. C., in Galactic Structure (edit. by Blaauw, A., and Schmidt, M.), 401 (University of Chicago Press, 1965).
Canizares, C. R., and Neighbours, J. E., Astrophys. J. Lett. (in the press).
Giacconi, R., et al., Astrophys. J. Suppl., 27, 37 (1974).
Clark, G. W., Astrophys. J. Lett. (in the press).
Bahcall, J. N., and Ostriker, J. P., Nature, 256, 23–24 (1975).
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MARKERT, T., BACKMAN, D., CANIZARES, C. et al. Observations of X rays from near NGC6440. Nature 257, 32–33 (1975). https://doi.org/10.1038/257032a0
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DOI: https://doi.org/10.1038/257032a0
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