0 Ultra - High - Density Molecular Core and Warped Nuclear Disk in the Deep Potential of Radio - Lobe Galaxy NGC 3079

We have performed high-resolution synthesis observations of the CO (J=1-0) line emission from the radio lobe edge-on spiral NGC 3079 using a 7-element mm-wave interferometer at Nobeyama, which consisted of the 45-m telescope and 6-element Array. The molecular nuclear disk (NMD) of 750 pc radius is found to be inclined by 20 from the optical disk, and the NMD has spiral arms. An ultra-high-density molecular core (UHC) was found at the nucleus. The gaseous mass of the UHC within 125 pc radius is as large as ∼ 3× 108M⊙•, an order of magnitude more massive than that in the same area of the Galactic Center, and the mean density is as high as ∼ 3× 10 H2 cm . A position-velocity diagram along the major axis indicates that the rotation curve starts at a finite velocity exceeding 300 km s already from the nucleus. The surface mass density in the central region is estimated to be as high as ∼ 105M⊙• pc , producing a very deep gravitational potential. We argue that the very large differential rotation in such a deep potential will keep the UHC gravitationally stable from current star formation. Subject headings: ISM: molecules — galaxies: individual (NGC 3079) — galaxies: ISM — galaxies: kinematics and dynamics — galaxies: nuclei — galaxies: structure — radio lines: ISM