Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-07-31
Astronomy and Astrophysics
Astrophysics
10 pages Latex, 8 fig. directories, each 22 galaxies ps figures. PASJ Vol. 50, No.5, in press
Scientific paper
We have obtained optical CCD spectroscopy along the major axes of 22 nearby spiral galaxies of Sb and Sc types in order to analyze their rotation curves. By subtracting the stellar continuum emission, we have obtained position velocity (PV) diagrams of the H alpha and [NII] lines. We point out that the H alphaline is often superposed by a broad stellar absorption feature (Balmer wind) in the nuclear regions, and, therefore, the [NII] line is a better tracer of kinematics in the central a few hundred pc regions. By applying the envelope-tracing technique to the H alpha and [NII] PV diagrams, we have derived nucleus-to-disk rotation curves of the observed galaxies. The rotation curves rise steeply within the central a few hundred parsecs, indicating rapidly rotating nuclear disk and mass concentration near the nucleus. [For more rotation curves : http://www.ioa.s.u-tokyo.ac.jp/]
Honma Mareki
Sofue Yoshiaki
Takeda Yoichi
Tomita Akihiko
Tutui Yoshinori
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