Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7330m&link_type=abstract
HST Proposal ID #7330
Mathematics
Logic
Hst Proposal Id #7330 Agn/Quasars
Scientific paper
Galactic bars are frequently invoked as a candidate for facilitating the transfer of mass from the interstellar medium of active galaxies to their central engines. However, recent ground-based studies of Seyferts indicate the incidence of bars in these active galaxies is no higher than that in normal spiral galaxies. Furthermore, numerical simulations indicate that gas inflow generated by a large-scale stellar bar does not extend down to the scales required to feed the central engine. However, these simulations also indicate that a series of nested gaseous bars may form in some cases, driving inflow of gas to the scales where the central blackhole dominates the potential. We propose to test this lqlq bars-within- bags q q model for fueling the nucleus with a NICMOS snapshot survey of a sample of Seyfert and normal galaxies. Ground-based near-infrared images already exist for these galaxies, but only the resolution of NICMOS can reach the size scales needed {10-50 pc} to test the model. We will combine the NICMOS images with existing data to: 1} search for small- scale stellar bars and the dust associated with gaseous bars, 2} search for differences between the active and normal galaxies that might explain the differences in observed activity, 3} search for nuclear tori expected in unified AGN models, and 4} compare the properties of small-scale bars, dust lanes and nuclear tori with the large-scale morphological features we see in our ground-based images.
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