Powering the narrow line regions in Seyfert galaxies - are radio jets the key?

Details Powering the narrow line regions in Seyfert galaxies - are radio jets the key? Powering the narrow line regions in Seyfert galaxies - are radio jets the key?

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8136m&link_type=abstract

HST Proposal ID #8136

Physics

Hst Proposal Id #8136 Agn Physics

Scientific paper

It has recently been argued that the energetic importance of Seyfert radio jets has been underestimated and that jets may provide the enough mechanical energy input to drive all the line emission in the Narrow Line Region {NLR} via shocks, reducing or eliminating the role played by nuclear photoionising radiation. However, despite the proximity of Seyferts, the poor angular resolution of radio images of their `jets' {more often seen as a string of knots rather than a jet} has prevented a direct causal relationship between the radio jet and NLR emission from being established. The relative contributions of direct photoionisation of emission line regions by the central continuum source, and strong interaction of the emission-line gas with radio plasma therefore remains controversial. For the first time, we have imaged the underlying radio jet in NGC4151, with unprecedented angular resolution {40 mas or 2.6pc} and here we propose matched resolution, spatially resolved, long s lit spectroscopy, to search for shock signatures due to hot gas along the straight, fine jet. This study will provide a powerful test of shock vs photoionisation models by utilising the full range of line diagnostics available with STIS, ranging from the FUV to the near IR, especially the key shock excited UV resonance lines, and will for the first time, directly establish the effect of a Seyfert radio jet on its surroundings.

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