On the Extraction of Optical Rotation Curves for Spiral Galaxies

Details On the Extraction of Optical Rotation Curves for Spiral Galaxies On the Extraction of Optical Rotation Curves for Spiral Galaxies

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jass...15...27s&link_type=abstract

Journal of Astronomy and Space Sciences, vol. 15, no. 1, p. 27-38.

Astronomy and Astrophysics

Astronomy

Scientific paper

We discussed four different methods - the single, double and triple Gaussian fits, and the intensity weighted centroid fit - which extract rotation curves from several emission lines ([OII], H_beta, [OIII], and H_alpha) 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 H_beta and H_alpha measured from rotation profiles are in a good agreement with H_alpha linewidth of Courteau (1992). However, linewidths of [OII] seems to be much broader than H_alpha, and the profile of [OIII] does not follow the profile of H_alpha.

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