Abstract
The detection of X-rays from the Large Cloud by Mark et al. (1969) leads to the question of optical aspects on the assumption that a power-law spectrum joins the radiofrequency and X-ray data. The integrated nonthermal radiofrequency spectrum (Mathewson and Healey, 1964) may extrapolate smoothly to the X-ray datum in the same way that the corresponding data of Vir A, Cas A, and Tau A do (Figure 1). But the integrated nonthermal radiofrequency spectrum of the Small Cloud (Mathewson and Healey, 1964) lies one order of magnitude lower than that of the Large Cloud in flux density, so that a corresponding X-ray source would not have detected by Mark et al. in agreement with their negative observation of it.
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Johnson, H.M. (1971). Optical Aspects of X-ray Sources in the Large Magellanic Cloud. In: Muller, A.B. (eds) The Magellanic Clouds. Astrophysics and Space Science Library, vol 23. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-6906-4_14
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