Abstract
21 cm profiles are compared with high resolution long slit Hα spectra. Asymmetries in intensity and velocity gradient in the spectra are apparent in the global profiles. When measured at 0.5 of peak intensity, the 21cm profile width and optical rotation curve match best.
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References
Rubin, V.C. Ford, W.K. Jr. Thonnard, N. 1980, Ap. J., 283, 471.
Tully, R.B. Fisher, J.R. 1977, Astron. Astrophys. 54, p.661.
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© 1983 International Astronomical Union
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Thonnard, N. (1983). Comparison of Global 21 cm Velocity Profiles with Hα Rotation Curves. In: Athanassoula, E. (eds) Internal Kinematics and Dynamics of Galaxies. International Astronomical Union/Union Astronomique Internationale, vol 100. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7075-5_5
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DOI: https://doi.org/10.1007/978-94-009-7075-5_5
Publisher Name: Springer, Dordrecht
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