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Published online by Cambridge University Press: 03 August 2017
The large-scale distribution of gas and dust in external galaxies seems to be closely correlated with the spiral arms and other main structural patterns. This was shown, in particular, by Baade and Mayall at the 1949 Symposium. A great many structural patterns exist among external galaxies; it is likely that these will prove to be important indicators of the dynamics and possibly of the evolution of cosmic gas clouds in stellar systems. This was pointed out at the 1953 Symposium by Hubble, whose original classification system was described in the report by Blaauw which includes also some indications given by Sandage of the program of revision and illustration of this system.
1 de Vaucouleurs, G., Mem. Commonwealth Obs., Canberra, III, No. 13 (1956).Google Scholar
2 de Vaucouleurs, G., Handbuch der Physik (Springer Verlag, Göttingen, to be published), Vol. 53.Google Scholar
3 Objects of low surface brightness (when it is not obviously due to local obscuration, e.g., as for IC 10, IC 342) are almost invariably dwarf systems; this particularity may be noted by a (d) preceding the symbol of the class which is usually either E or I. The existence of dwarf lenticulars and spirals remains to be demonstrated. Criteria are still lacking for the assignment of objects to the giant and supergiant groups on purely morphological grounds.Google Scholar
4 de Vaucouleurs, G., Astrophys. J. 127, 487 (1958).CrossRefGoogle Scholar
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