Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8259w&link_type=abstract
HST Proposal ID #8259
Physics
Hst Proposal Id #8259 Agn Physics
Scientific paper
Recent progress in understanding the kinematics of the Narrow Line Region {NLR} in Seyfert galaxies has identified three distinct components -- a high velocity nuclear flow, a more widespread gravitational component, and a jet-accelerated component. In this proposal, we aim to isolate and study the high velocity nuclear flow. The observational signature of this component is the famous `blue wing' found on the OIIILambda5007 lines of almost all Seyfert galaxies. Its ubiquity and amplitude suggest high velocity radial flows are present, together with a source of opacity {dust}. Surprisingly, although this feature was the first to be identified, its origin and nature are still unknown. The main stumbling block is its compact size and our ignorance of the location of the dust. In this proposal, we select two nearby Seyferts with exceptionally strong blue wings. Using WFPC2 we map the near nuclear distributions of dust and emission lines, while STIS allows us to track in det ail the near nuclear OIII velocity field. Together, these data allow a number of tests of the nature and direction of the near nuclear flow. This is the last zone of the NLR to be understood, and yet it plays a crucial role in carrying that understanding inwards towards the BLR.
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