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Title:
The structure of the Small Magellanic Cloud. II
Authors:
Mathewson, D. S.; Ford, V. L.; Visvanathan, N.
Affiliation:
AA(Mount Stromlo and Siding Spring Observatoires, Canberra, Australia), AB(Mount Stromlo and Siding Spring Observatoires, Canberra, Australia), AC(Mount Stromlo and Siding Spring Observatoires, Canberra, Australia)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. 617-645 (ApJ Homepage)
Publication Date:
10/1988
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Fiber Optics, Galactic Structure, H I Regions, Magellanic Clouds, Radio Sources (Astronomy), Radio Telescopes, Cepheus Constellation, Emission Spectra, Radial Velocity, Supergiant Stars
DOI:
10.1086/166772
Bibliographic Code:
1988ApJ...333..617M

Abstract

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.

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