Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9493c&link_type=abstract
HST Proposal ID #9493
Other
Hst Proposal Id #9493
Scientific paper
HST imaging of low luminosity FR I radio-galaxies allowed us to isolate for the first time their optical nuclear emission from that of the host galaxy. Fluxes of these unresolved nuclear sources strongly correlate with those of the radio- cores, suggesting a common non-thermal origin. The picture which emerges is that these radio-galaxies differ in many fundamental aspects from the other classes of AGN as they might be lacking the substantial BLR, thermal disk emission and torii, usually associated to active nuclei, probably reflecting a fundamentally different accretion mode. On the other hand, these results support the identification of FR I as the misoriented population of BL Lac objects. It is crucial at this stage to firmly establish the synchrotron origin of these nuclear sources. A simple and direct test can be performed by measuring their polarization. In case of synchrotron emission we expect to detect significant nuclear polarization, as routinely measured in BL Lac objects, at level of 3 - 20 We thus propose to obtain imaging polarimetry of a sample formed by the 9 nearest FR I radio- galaxies.
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