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- W1967486574 abstract "In the fall of 1951 observations were started at the Mount Wilson Observatory for the purpose of finding out whether the interstellar lines in distant early-type stars showed any systematic feature which might indicate a large-scale arrangement of the interstellar gas clouds in space. The problem was suggested by the results of the observations by W. A. Baade of the Andromeda nebula,1 which have shown that the phenomenon of spiral structure is primarily associated with the distribution of interstellar matter. If the galactic system has, then, any structural features similar to those observed in M 31, they should be apparent in the large-scale distribution of interstellar gas. For, in a general way, one would expect that the forces which concentrate the interstellar dust along the spiral arms, whatever their precise nature is, would act essentially in the same fashion also on the interstellar gas. Shortly after the observations began, Morgan, Osterbrock, and Sharpless,2 for the first time, offered definite evidence concerning the spiral structure of the galactic system. They showed that the Hu regions in the neighborhood of the sun are arranged in a manner resembling the observed alignment of the emission regions along the spiral arms of M 31. On the basis of this tentative model for the spiral arms near the sun, it became apparent that any possible concentration of the gas clouds along them would be most easily detected in directions normal to their course. In the northern hemisphere this direction falls outside the area of the sky accessible to the coude spectrograph of the 100-inch telescope. And for this reason, as soon as the coude spectrograph of the 200-inch reflector went into operation (summer, 1952), the observations of distant stars in the northern Milky Way were started. Although the observing program is not yet finished, it is believed that the results derived from the spectrograms so far" @default.
- W1967486574 created "2016-06-24" @default.
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- W1967486574 date "1953-08-01" @default.
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- W1967486574 title "Galactic Structure and the Distribution of Interstellar Gas" @default.
- W1967486574 doi "https://doi.org/10.1086/126574" @default.
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