Computer Science
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..182c&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Computer Science
Scientific paper
We review the properties of the atomic and ionised components of the (<1kpc scale) circumnuclear gas in AGN; primarily as traced by high resolution radio observations. In both Seyferts and radio-loud objects there is evidence from HI absorption observations for disks of atomic gas. In the Seyferts the plane of the atomic gas seems to be associated with the galactic plane and the gas generally occurs at large radii (100pc -1kpc). In contrast in the radio-loud objects the atomic gas lies closer to the central engine (10pc - 100pc) and the plane of the gas may be closer to perpendicular to the radio jets. The difference in properties may be due to the presence of a hard X-ray source in the radio loud objects which heats the circumnuclear gas. This effect might also explain the general lack of molecular masers or molecular absorption in radio loud objects. In several radio loud objects there appears to be a continuous change in properties from molecular gas at HST resolution at 1kpc to atomic gas at 10pc-100pc, to ionised gas at 1pc-10pc. The resulting extended disk may provide the fuel for the nuclear activity. In addition part of the circumnuclear disk may provide the obscuring region required by unified schemes. Finally we discuss come clear cases from VLBI HI absorption observations of jet-cloud interactions and their implications.
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