Other
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..190p&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Other
Scientific paper
The orientation-based Unified Scheme for Active Galactic Nuclei (AGN) predicts dense gas in an obscuring disk- or torus-structure around the central engine of the galaxy. This idea has been investigated in a number of observations, both in radio and at other wavelengths, and in many cases it has been shown that the gas is associated with the central parts of the galaxies. For instance HST imaging has revealed the presence of gas and dust in a 240 pc radius disk, perpendicular to the jet axis in the FRI galaxy NGC4261. Moreover, from high-resolution VLBI observations this disk is now known to have associated HI absorption. Such high-resolution interferometry observations are important tools when investigating vital issues such as obscuration of AGN, central masses and kinematics and the physical state of the circumnuclear gas. To investigate if such circumnuclear gas is as common as predicted, we observed during the summer of 1998 using the WSRT at UHF and L-band a number of FRII radio galaxies and Compact Symmetric Objects. Our intention was that follow-up VLBI observations should be made of the detected sources to give a more exact spatial location of the absorbing gas. Here we report on the result from these investigations.
Conway John E.
Pihlström Ylva M.
Vermeulen Rene C.
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