Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8361f&link_type=abstract
HST Proposal ID #8361
Other
Hst Proposal Id #8361 Agn Hosts And Environment
Scientific paper
We recently completed an optical spectroscopic survey of nearby galaxies that has shown that a substantial fraction of all galaxies, especially those of early Hubble type, exhibit active galactic nuclei. Under the assumption that these are powered by supermassive black holes {SMBHs}, we conclude that SMBHs appear to be common constituents of many, but not necessarily all, elliptical and bulge-dominated galaxies. We wish to investigate why some galaxy bulges seem more conducive than others to hosting SMBHs, or at least SMBHs with associated activity. We propose to conduct a study of near-IR {NIR} archival NICMOS images of galaxies from a representative sample of ``active'' and ``normal'' disk galaxies {S0-Sc} selected from our spectroscopic survey in order to {1} quantify the bulge luminosity and {2} perform a comparative study of the structural parameters of the bulges detected. The brightness profiles of the central regions can be quantified much more reliably in the NIR than in the optical because of the lower dust extinction and reduced sensitivity to nuclear spiral arms and star-forming regions. In addition, we will use the images to search for small-scale nuclear bars, either stellar or gaseous, as well as nuclear star clusters, both of which have been suggested as possible mechanisms for fueling the central engine.
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