Abstract
The six or eight optically identified X-ray sources comprise starlike objects and extended supernova remnants in the Galaxy, well as as a radio galaxy and a quasar. Both X-ray and radiofrequency radiation penetrate the entire galactic plane, but only two or three galactic radio sources have nbeen identified with X-ray sources. This has led Hayakawa et al. (1) to postulate that detectable X-ray sources are not farther than 1 kpc. However, other studies suggest that there is a cluster of a few intrinsically bright sources actually near the galactic nucleus and a scattering of weaker sources near the sun (2, 3).
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References
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Johnson, H.M. (1968). Optical and Radio Information. In: Perek, L. (eds) Highlights of Astronomy. International Astronomical Union / Union Astronomique Internationale, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3417-3_19
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DOI: https://doi.org/10.1007/978-94-010-3417-3_19
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