15min:

N. HARADA, Department of Physics, The Ohio State University, Columbus, OH, U.S.A., 43210; T. A. THOMPSON, Department of Astronomy and Center for Cosmology and Astro-Particle Physics (CCAPP), The Ohio State University, Columbus, OH, U.S.A., 43210; AND E. HERBST, Departments of Physics, Astronomy, and Chemistry, The Ohio State University, Columbus, OH, U.S.A., 43210.

There are galactic nuclei that emit high luminosities L 10^44-46 erg s^-1 including luminosity produced by X-rays from high mass accretion onto the central black holes. These nuclei are called active galactic nuclei (AGNs), and they are accompanied by molecular disks. Observations show high abundances of CN and HCN in the disks; the molecules are proposed to be probes of X-ray dominated regions (XDRs) created by the X-rays from AGNs. We have constructed a spatially-dependent chemical-abundance model of the molecular disk in NGC 1068, a typical AGN-dominated galaxy. Recently, new observations of CN and HCN have been made at much higher spatial resolution, and there are also detections of polyatomic molecules such as HC₃N, c-C₃H₂, and C₂H. We discuss how these observations and our simulations can help us to better understand the physical conditions, the disk structure, and conditions for star formation within molecular disks, which are still uncertain. We also include a comparison with other types of galaxies such as (ultra-) luminous infrared galaxies.