Evidence for an outflow from the Seyfert galaxy NGC 4051
arXiv:astro-ph/9608134 · doi:10.1093/mnras/284.2.385
Abstract
New observations using narrow band imaging, long-slit spectroscopy and MERLIN observations of the nuclear region of the Seyfert galaxy NGC~4051 have been made. An edge brightened, triangular region of ionized gas extending 420 pc from the centre of the galaxy has been detected. Long-slit spectra of this ionised gas, taken at 1.5\arcsec\ from the core, show the \oiii\ emission line to consist of two velocity components, both blue-shifted from the systemic radial velocity, with velocity widths of 140\kms\ and separated by 120\kms. This region is co-spatial with weak extended radio emission and is suggestive of a centrally driven outflow. The \oiii\ line spectrum and image of this region have been modelled as an outflowing conical structure at 50\degr\ to the line of sight with a half opening angle of 23\degr . In addition to the extended structure, high resolution MERLIN observations of the 18-cm nuclear radio emission reveal a compact (1\arcsec) radio triple source in PA 73. This source is coincident with the HST-imaged emission line structure. These high resolution observations are consistent with a more compact origin of activity (i.e. a Seyfert nucleus) than a starburst region.
latex, epsf.sty, 8 pages, 8 figures. Also available at http://axp2.ast.man.ac.uk:8000/Preprints.html
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