Nuclear-to-Outer Rotation Curves of Galaxies in the CO and HI Lines

Preprint
Publisher Website
Google Scholar
  • 19 November 1996
Abstract
We have derived rotation curves of nearby galaxies, which are almost completely sampled from the inner to outer regions. We used high-resolution position-velocity diagrams in the CO line along the major axes for the inner regions, and HI-line data for the outer regions. We combined the CO and HI data to obtain total rotation curves from the nuclear to outer regions. The rotation curves show a steep nuclear rise within a radius smaller than the resolutions of CO-line observations, indicating a compact massive concentration near the nucleus. We show that the nuclear steep rise is general and universal, and a rigid body-like gentle rise is exceptional. Keywords: Galaxies: kinematics -- Galaxies: rotation -- Galaxies: structure -- Galaxies: general -- ISM: CO emission -- ISM: HI gas

This publication has 0 references indexed in Scilit: