IRAS04210+0400: Modeling the optical spectra from flaring large scale jets

Details IRAS04210+0400: Modeling the optical spectra from flaring large scale jets IRAS04210+0400: Modeling the optical spectra from flaring large scale jets

1996-05-10

arxiv.org/abs/astro-ph/9605049v1

Astronomy and Astrophysics

Astrophysics

LaTeX (MN style-file), 10 pages, accepted by MNRAS, available online at http://axp2.ast.man.ac.uk:8000/Preprints.html

Scientific paper

The emission-lines in the active galaxy IRAS\,0421+0400 show a dramatic ($\sim$\,900\kms) increase in the velocity spread at the position of radio hot-spots which are located at the beginning of extended radio lobes. We study a simple geometric model of an opening outflow which reproduces the structure found in the long-slit emission-line spectrum of the hot-spot regions. The predicted bifurcations in the optical image structure of these regions is confirmed by deep \oiii\,line-imaging. We propose that this phenomenon is the result of a jet emerging from the galaxy through the boundary between the interstellar and intergalactic medium. A similar model has previously been suggested as an explanation for wide angle tail radio sources (WAT's). If our model proves to be correct in more detailed future observations, then IRAS\,0421+0400 provides a unique possibility to study the flaring jet phenomenon at optical wavelengths.

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