Other
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..513t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, June 1, 1987, p. 513-529.
Other
28
Celestial Mechanics, Kinematics, Magellanic Clouds, Radial Velocity, Velocity Distribution, Fabry-Perot Interferometers, H Alpha Line, H Ii Regions, Hydrogen Ions, Interstellar Gas
Scientific paper
New H-alpha interferometric observations in the SMC are reported and discussed together with radial-velocity (RV) determinations for other objects from the literature in connection with the rather confused kinematics of this galaxy. The RV field of diffuse H II as obtained from the present Fabry-Perot measurements is quite similar to that of neutral hydrogen in many aspects, and shows several partially overlapping velocity groups which are also seen in other objects besides H I; namely, planetary nebulae, emission regions, interstellar Ca II, and supergiant stars. Detailed velocity correlation with neutral gas is found to be quite good. Available data on the motion of individual H II regions and associated stars in the SMC indicate that their RV gradient is considerably steeper than the value derived for diffuse H II and other objects typically found in the disk of normal galaxies, while in the Galaxy there seems to be no such difference. A low-velocity H II feature 1 deg in diameter is seen at about 95 km/s in the bar of the SMC, and the observations confirm that the K1 region is receding at a velocity about 20 km/s higher than that of the main body.
Carranza Gustavo J.
Torres Gabino
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