Abstract
MEASUREMENTS of high energy X rays in the region of the Crab Nebula were made with the Imperial College detector on Ariel V between April 13 and April 29, 1975. During that time the X-ray nova A0535+26 was first detected and observed to rise to its maximum intensity1,2. At 30 keV this nova reached an intensity considerably brighter than the Crab Nebula, making it the brightest known source in the sky.
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References
Rosenberg, F. D., Eyles, C. J., Skinner, G. K., and Willmore, A. P., Nature, 256, 628–630 (1975).
Ricketts, M. J., Turner, M. J. L., Page, C. G., and Pounds, K. A., Nature, 256, 631–633 (1975).
Felton, J. E., and Rees, M. J., Astr. Astrophys., 17, 226 (1972).
Pringle, J. E., and Rees, M. J., Astr. Astrophys., 21, 1 (1972).
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COE, M., CARPENTER, G., ENGEL, A. et al. Hard X-ray measurements of nova A0535+26 in Taurus. Nature 256, 630–631 (1975). https://doi.org/10.1038/256630a0
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DOI: https://doi.org/10.1038/256630a0
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