The velocity fields and radio structures of the active galaxies NGC 5643 and NGC 7582

Details The velocity fields and radio structures of the active galaxies NGC 5643 and NGC 7582 The velocity fields and radio structures of the active galaxies NGC 5643 and NGC 7582

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..193m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Sept. 1, 1985, p. 193-217.

Astronomy and Astrophysics

Astronomy

77

Active Galaxies, Barred Galaxies, Galactic Rotation, Radio Astronomy, Seyfert Galaxies, Astronomical Maps, H Alpha Line, H Ii Regions, Oxygen Spectra, Velocity Distribution

Scientific paper

The authors present optical emission line velocity fields obtained using TAURUS of the two barred spiral Seyfert galaxies NGC 5643 and NGC 7582, and VLA radio continuum maps of NGC 5643. Both galaxies show slowly rising rotation curves to the limit of the measurements and distortions of their velocity fields near the bars. These distortions are qualitatively similar to models of gas flow in a barred potential. The authors speculate that in NGC 5643, the bar causes gas to flow into the nucleus and form a compact disc with rotation axis parallel to the bar. In NGC 7582, the circum-nuclear Hα emission suggests a rotating disc of H II regions in the plane of the galaxy. The non-thermal radio emission probably originates in many supernova remnants. The authors suggest that most of the [O III] line emission originates from high excitation gas expanding outwards from the nucleus in a cone. A detailed model with this configuration closely matches many aspects of the observations.

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