Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5909j&link_type=abstract
HST Proposal ID #5909
Other
Hst Proposal Id #5909 Agn
Scientific paper
We propose the most detailed imaging study yet undertaken of a wide range of lines in the prototypical radio galaxy Cygnus A. Lines of ionization states from OI to OIII will be investigated and correlated in detail with each other and with the radio structure. The data will allow us to investigate the physical mechanisms operating in each separate part of the source and hence to disentangle the influences of nuclear photoionization and shocks induced by the passage of the radio jet. The data will also allow us to clarify the current confusion regarding the possible nitrogen overabundance. Since all the phenomena occur within a radius of 0.5" this is not possible from the ground: we know from previous investigations that clumping takes place on scales (0.1--0.2 arcsecond) that are only accessible to the HST. Our ultimate goal will be to determine what parts of the extended line and continuum emission have their origins in photoionization by a hidden nucleus (quantifying the degree of anisotropy with which this nucleus emits) and what parts are shock excited (determining with unprecedented clarity the physical conditions in the shocks).
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