- Sohn, Young-Jonh
 
								- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
 
								- 15, n.1
 
								- pp.27-38
 
								- 1998
 
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								We discussed four different methods - the single, double and triple Gaussian fits, and the intensity weighted centroid fit - which extract rotation curves from several emis-sion lines(i.e. [OII], <TEX>$H{\beta}$</TEX>, [OIII], and <TEX>$H{\alpha}$</TEX>) of spiral galaxies. Spatial extents and the shapes of rotation curves derived through various methods applying to each emission lines of a sample galaxy UGC 11635 are all in a good agreement with one another. Linewidths of <TEX>$H{\beta}$</TEX> and <TEX>$H{\alpha}$</TEX> measure from rotation profiles are in a good agreement with <TEX>$H{\alpha}$</TEX> linewidth of Courteau (1992). however, linewidths of [OII] seems to be much broader than <TEX>$H{\alpha}$</TEX>, and the profile of [OIII] does not follow the profile of <TEX>$H{\alpha}$</TEX>.