paper

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

arXiv:astro-ph/9611144 · doi:10.1093/pasj/49.1.17

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

To appear in PASJ vol.49, No.1, 1997, Plain TeX

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