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- W2283561098 abstract "Our own stellar system has been studied in some detail by the Leiden and Sydney groups, whose maps of the large-scale hydrogen distribution are well-known; these are discussed by Lindblad in Paper 24 of this Symposium volume. The distances in our Galaxy are sufficiently small to reveal significant structure on the order of size of spiral arms, but the lack of a direct distance scale, with an indirect scale to be inferred from velocity models, is a serious handicap in reaching definite conclusions about the symmetry, number of spiral features, and inclination of spiral arms. In fact it is very difficult to decide whether the gas arms coincide with the spiral arms as defined by stars. By the study of external galaxies one can remove the scale uncertainty, but only at the cost of a serious lack of detailed information on the structure, because angular resolution is relatively poor, even with the largest existing telescopes. The largest, the 300-foot (91-m) transit telescope of the National Radio Astronomy Observatory at Green Bank, West Virginia, has a beamwidth of 10′ (arc) at 21 cm, which is larger than the angular dimensions of all but the closest external galaxies." @default.
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- W2283561098 date "1967-01-01" @default.
- W2283561098 modified "2023-09-26" @default.
- W2283561098 title "Comparison of the distribution and motion of atomic hydrogen in our own Galaxy and in other spiral systems" @default.
- W2283561098 cites W2032011086 @default.
- W2283561098 doi "https://doi.org/10.1017/s0074180900100920" @default.
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