Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf...34k&link_type=abstract
The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb
Physics
6
Scientific paper
High resolution (a few arcseconds) observations of CO(1 - 0) and HCN(1 - 0) emission from nearby Seyfert galaxies have been conducted with the Nobeyama Millimeter Array. Based on the observed CO distribution and kinematics, we suggest that a small scale (a few 100 pc - a few kpc) distortion of the underlying potential seems to be necessary for Seyfert activity, although it is not a sufficient condition. We also find that Toomre's Q values in the centers of Seyfert galaxies tend to be larger than unity, suggesting the circumnuclear molecular gas disks around Seyfert nuclei would be gravitationally stable. The HCN/CO integrated intensity ratios (R_{HCN/CO}) range over an order of magnitude, from 0.086 to 0.6. The Seyfert galaxies with high R_{HCN/CO} may have an extended (r ~100 pc scale) envelope of obscuring material. The presence of kpc scale jet/outflows might be also related to the extremely high R_{HCN/CO}.
Kawabe Ryo
Kohno Kotaro
Vila-Vilaro Baltasar
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