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Superassociations in distant galaxies

Published online by Cambridge University Press:  14 August 2015

V. A. Ambartsumian
V. A. Ambartsumian*
Affiliation:
Byurakan Observatory

Extract

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It is well known that the Large Magellanic Cloud contains in addition to a considerable number of ordinary O-associations a certain number of large objects which, however, are similar in nature to the associations. These objects were named “constellations” by Shapley. But the large complex 30 Doradus surpasses notably all of these objects both in diameter and in absolute brightness. The latter is of the order of −15m0 while its diameter is of the order of 600 pc. If we take the average absolute brightness of associations in our Galaxy as equal to −10m0 then it turns out that 30 Doradus is 100 times more luminous than the ordinary associations. The photographic images of more distant galaxies reveal that sometimes complexes occur in them of the same order of luminosity and dimensions as 30 Doradus. Therefore it seems to us useful to regard these complexes as a special class of objects and call them superassociations.

Type
Section 1: The Galaxy
Information
Symposium - International Astronomical Union , Volume 20: The Galaxy and the Magellanic Clouds , 1964 , pp. 122 - 126
Copyright
Copyright © Australian Academy of Science 1964 

References

Ambartsumian, V. A. (1939).—“Theoretical Astrophysics.” (Moscow, Leningrad.)Google Scholar
Johnson, H. M. (1959).— P.A.S.P. 71: 425–34.Google Scholar
Shapley, H., and Paraskevopoulos, J. S. (1937).— Ap. J. 86: 340–2.Google Scholar