Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7521b&link_type=abstract
HST Proposal ID #7521
Physics
Hst Proposal Id #7521 Agn/Quasars
Scientific paper
Ground-based surveys of FR-I {Fanaroff-Riley type I} and FR-II host galaxies have shown that a majority of these galaxies are ellipticals that are strongly interacting with a close companion. This clearly suggests that there is a connection between the interactions and the nuclear radio activity. To search for physical evidence of this itinteraction-activity connection, we propose to use archival HST images to analyze the subarcsecond nuclear morphology in a wide variety of elliptical galaxies. This data set includes a sufficient number of most of the relevant objects to facilitate a strong statistical evaluation of the role and effects of interactions on nuclear activity. The following pairs of objects will be compared: FR-I versus FR-II radio galaxies, radio-loud versus radio-quiet ellipticals, and interacting versus non- interacting ellipticals. We are proposing a companion GO program to compensate for the lack of images of strongly interacting FR-I hosts in the HST archive. Our unique contribution to the analysis of these archived images is that, unlike the original investigators on those programs, we plan to investigate the interaction-activity connection - to quantify for the first time the parameters of the interaction and to tie these into the properties of the radio emission {luminosity, core versus total emission, morphology}. We hope to measure and to demonstrate conclusively the effects of strong gravitational interactions on the nuclear regions of the radio host galaxies and consequently to validate the interaction-activity connection.
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