Physics – Optics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333..617m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. 617-645
Physics
Optics
82
Fiber Optics, Galactic Structure, H I Regions, Magellanic Clouds, Radio Sources (Astronomy), Radio Telescopes, Cepheus Constellation, Emission Spectra, Radial Velocity, Supergiant Stars
Scientific paper
Systemic velocities and distances of 61 Cepheids in three 40arcmin diameter fields in the bar of the SMC have been measured using multiobject fiber-optic spectroscopy with the AAT and IR photometry on the 2.3 m telescope at Siding Spring Observatory. The results of a high velocity resolution H I survey of this region with the Parkes 64 m radio telescope are also presented together with velocity data for other Population I components obtained by other workers. The Cepheid distance measurements confirm previous work that the SMC has a depth of about 20 kpc and the northeastern section of the bar is 10 - 15 kpc closer than the southern section. The new velocity data agree with the hypothesis that the SMC collided with the LMC some 2×108years ago. The general picture of the structure and kinematics of the SMC supports the view that the SMC is a galaxy disrupted by this collision.
Ford V. L.
Mathewson D. S.
Visvanathan Natarajan
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