Physics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.266..607m&link_type=abstract
Nature, vol. 266, Apr. 14, 1977, p. 607, 608. Research supported by the Science Research Council.
Physics
15
Cosmic Dust, Galactic Nuclei, Galactic Structure, Interstellar Gas, Milky Way Galaxy, Galactic Mass, Galactic Rotation, Leading Edges, Mass Distribution, Radial Velocity, Spiral Galaxies, Star Distribution, Trailing Edges
Scientific paper
An explanation for the distribution of interstellar matter in the central region of the Galaxy is proposed on the basis of a hypothetical stellar bar at the center. Calculations of the gas flow in barred spirals are discussed which show that two pairs of shocks are formed (a pair of radial shocks on the leading edge of the bar and a pair of trailing spiral shocks originating near the bar-gas corotation points) and cause the stellar bar to act as a 'vacuum cleaner' that sweeps gas and dust away from the corotation region. Observations suggesting the presence of a small central bar at the center of ordinary spiral galaxies are noted. The mass of the proposed bar at the center of the Galaxy is estimated to be less than one tenth of the total galactic mass on the assumption that the bar is the most massive constituent within the hypothetical bar-gas corotation point at approximately 2 kpc.
Matsuda Takuya
Nelson Alistair H.
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