Jet-cloud interations and the brightening of the narrow line region in Seyfert galaxies

Details Jet-cloud interations and the brightening of the narrow line region in Seyfert galaxies Jet-cloud interations and the brightening of the narrow line region in Seyfert galaxies

1997-10-16

arxiv.org/abs/astro-ph/9710178v1

Astronomy and Astrophysics

Astrophysics

11 pages, 3 figures, accepted for publication in The Astrophysical Journal Letters

Scientific paper

10.1086/311066

We study the kinematical and brightness evolution of emission line clouds in the narrow line region (NLR) of Seyfert galaxies during the passage of a jet. We derive a critical density above which a cloud remains radiative after compression by the jet cocoon. The critical density depends mainly on the cocoon pressure. Super-critical clouds increase in emission line brightness, while sub-critical clouds generally are highly overheated reducing their luminosity below that of the inter-cloud medium. Due to the pressure stratification in the bow-shock of the jet, a cylindrical structure of nested shells develops around the jet. The most compact and brightest compressed clouds surround the cloud-free channel of the radio jet. To support our analytical model we present a numerical simulation of a supersonic jet propagating into a clumpy NLR. The position-velocity diagram of the simulated H_alpha emission shows total line widths of the order of 500 km/s with large-scale variations in the radial velocities of the clouds due to the stratified pressure in the bow-shock region of the jet. Most of the luminosity is concentrated in a few dense clouds surrounding the jet. These morphological and kinematic signatures are all found in the well observed NLR of NGC1068 and other Seyfert galaxies.

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