Spectroscopic Indications of an Internal Spiral Arm in the Galaxy

Details Spectroscopic Indications of an Internal Spiral Arm in the Galaxy Spectroscopic Indications of an Internal Spiral Arm in the Galaxy

Dec 1956

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1956natur.178.1458t&link_type=abstract

Nature, Volume 178, Issue 4548, pp. 1458 (1956).

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Scientific paper

SPIRAL structure within our galaxy has been detected by three methods: (a) space-plotting of stellar associations1, (b) multiple structure in the H 21 cm. radiation2, (c) multiple structure in the interstellar lines of Ca II and Na I in distant stars3. The radio method (b) has the advantage over the two optical methods in that it will penetrate to the limits of the galaxy. On the other hand, the interpretation of the radio profiles for directions within 90° of the galactic centre is greatly complicated by the superposition of radiation from regions at very different distances which have the same angular velocity. By contrast, method (c) can reveal unambiguously the presence of one, two or more spiral arms within a light-path limited by a distant star. The limited light-paths used in method (c) are of advantage in the internal regions of the galaxy.

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