Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7281f&link_type=abstract
HST Proposal ID #7281
Mathematics
Logic
Hst Proposal Id #7281 Agn/Quasars
Scientific paper
The study of low luminosity radio galaxies {LLRG} has been recently stimulated by several new results. The discovery of extended accretion disks and supermassive black holes, all found to be associated with LLRG, might provide a direct approach to measure key parameters such as the accretion rate and the black hole mass in AGNs. All but one of the known optical jets are found in LLRG and this has certainly important bearings on the acceleration and energy transport processes in the radio sources. LLRG play a fundamental role also in the unification schemes of radio loud AGNs as they are identified as the parent population of BL Lac objects. We therefore propose to perform a snapshot survey of the B2 sample which consists of 103 LLRG. It provides an excellent representation of the radio source types encountered below and around the break in the radio luminosity function. This survey will produce a homogenoeus set of images of LLRG which is complementary to those previously obtained with HST for the high luminosity 3CR radio sources, thus allowing a straighfroward comparison. This program is aimed to answer the following key questions: How common are extended nuclear disks? What is their orientation and morphology? How common are optical jets? What is the relationship between properties of the nuclear regions and of the host galaxies of FR I, FR II and BL Lacs? Do the FR I host galaxies present morphological peculiarities, such as tidal distorsions or nuclear cusps?
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