Abstract
THE high-resolution observations of the radio source Cassiopeia A by Ryle, Elsmore and Neville1 show for the first time details of the structure of the source that suggest an interpretation of a feature of the nebulosity connected with the source the significance of which was not clear. The nebulosity is essentially a circular shell with an outer radius of 2.0 min of arc, but it shows a flare in position angle 70° that extends to a distance of about 3.8 min of arc from the centre2. The long streaks of nebulosity plotted by Ryle et al. at the east side of the source (α = 23h 21m 21s; δ = + 58° 33.5′ and α = 23h 21m 31s; δ = + 58° 33.1′) are the brightest features of the flare. They and the fainter details of the flare extend radially while the features of the shell show no strongly preferential direction.
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References
Ryle, M., Elsmore, B., and Neville, Ann C., Nature, 205, 1259 (1965).
Minkowski, R., Paris Symposium on Radio Astronomy, edit. by Bracewell, R. N., 315 (Stanford University Press, 1959).
Oort, J. H., Problems of Cosmical Aerodynamics, 118 (Central Air Documents Office, Dayton, Ohio, 1951).
Minkowski, R., Rev. Mod. Phys., 30, 1048 (1958).
Zwicky, F., Ann. Astrophys., 27, 300 (1964).
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MINKOWSKI, R. The Radio Source Cassiopeia A. Nature 209, 1339–1340 (1966). https://doi.org/10.1038/2091339a0
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DOI: https://doi.org/10.1038/2091339a0
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