NUCLEAR-TO-OUTER ROTATION CURVES OF GALAXIES IN THE CO AND HI LINES

We have derived rotation curves of nearby galaxies, which are almost c ompletely sampled from the inner to outer regions. We used high-resolu tion position-velocity diagrams in the CO line along the major axes fo r the inner regions, and HI-line data for the outer regions. We combin ed the CO and HI data to obtain total rotation curves from the nuclear to outer regions. The rotation curves show a steep nuclear rise withi n a radius smaller than the resolutions of the GO-line observations, i ndicating a compact massive concentration near the nucleus. We show th at the nuclear steep rise is general and universal, and that a rigid b ody-like gentle rise is exceptional.