Evidence for an outflow from the Seyfert galaxy NGC | Zendy

P. E. Christopoulou | Zendy; A. J. Holloway | Zendy; W. Steffen | Zendy; C. G. Mundell | Zendy; A. H. C. Thean | Zendy; C. Goudis | Zendy; J. Meaburn | Zendy; A. Pedlar | Zendy

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Evidence for an outflow from the Seyfert galaxy NGC

Author(s) -

P. E. Christopoulou,

A. J. Holloway,

W. Steffen,

C. G. Mundell,

A. H. C. Thean,

C. Goudis,

J. Meaburn,

A. Pedlar

Publication year - 1997

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/284.2.385

Subject(s) - physics , astrophysics , galaxy , outflow , emission spectrum , line (geometry) , line of sight , spectral line , astronomy , merlin (protein) , geometry , medicine , mathematics , cancer , meteorology , suppressor

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 øiii\ 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 øiii\ 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$^{\circ}$. 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

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