Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6657t&link_type=abstract
HST Proposal ID #6657
Physics
Hst Proposal Id #6657 Agn
Scientific paper
It is clear that jet/cloud interactions play an important role in defining the morphology, kinematics and ionization of the extended gas in active galaxies, we are still far from understanding the physical mechanisms involved. Recent long-slit observations of powerful radio galaxies show clear evidence for shocks in the extended emission line regions, with complex, broad emission line profiles, and an anti-correlation between line width and ionization state. These observations provide the first indication that we have resolved the jet shocks kinematically. In order to model the jet/cloud interactions in depth it is now essential to resolve the shock structures spatially. Therefore, we apply for narrow-band imaging observations with WFPC2 on the HST to map the ionization structures in a small sample of objects in detail. The observations will be used to measure the cooling length of the shocked gas, and to investigate the spatial relationships between different kinematic components and the radio structure. In this way we will make the first stringent test of the idea that the properties of the warm emission line gas along the radio jets are determined more by jet/cloud interactions than by AGN illumination. As well as being fundamental to our general understanding of the emission line physics of active galaxies, these are key observations for understanding the alignment effect in
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