Radio Outflows and the Origin of the Narrow-Line Region in Seyfert Galaxies

Details Radio Outflows and the Origin of the Narrow-Line Region in Seyfert Galaxies Radio Outflows and the Origin of the Narrow-Line Region in Seyfert Galaxies

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...469..554c&link_type=abstract

Astrophysical Journal v.469, p.554

Astronomy and Astrophysics

Astronomy

93

Galaxies: Active, Galaxies: Seyfert, Galaxies: Structure, Infrared: Galaxies, Radio Continuum: Galaxies

Scientific paper

We present the results of Hubble Space Telescope medium-band imaging of four Seyfert 2 galaxies, Mrk 573, Mrk 348, Mrk 3, and Mrk 78, which show extended radio emission, and ground based Johnson A images of Mrk 3 and Mrk 78 obtained with the William Herschel Telescope. Together these two data sets allow us to investigate the relationship between the narrow-line region (NLR) emission structure, the radio structure, and the large-scale morphology of the host galaxy. In all four objects there is a close association between the NLR emission-line morphology and that of the radio emission. Furthermore, it appears that the NLR takes a different form depending on the structure of the radio emission. The emission-line regions associated with the radio lobes are shell-like or bow shock-like, while those associated with the jets are linear. In Mrk 573, the emission-line ratios [O III]/[O II] and [O III]/Hα show only a slow increase with radius between the bow shocks ([O III]/[O II] ~3 and [O III]/Hα ~ 1.5, r < 2") and the outer filaments [O III]/[O II] ~ 4 and [O III]/Hα ~ 2.2"

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