Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...197...75w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 197, no. 1-2, May 1988, p. 75-82.
Astronomy and Astrophysics
Astrophysics
13
Emission Spectra, Galactic Nuclei, Interstellar Matter, Line Spectra, Nuclear Radiation, Seyfert Galaxies, H Ii Regions, High Resolution, Molecular Clouds, Velocity Distribution
Scientific paper
The authors obtained narrow-band direct images and long slit spectrograms of medium and high resolution (Δv = 60 km s-1 and 15 km s-1) of the nucleus of the Seyfert 2 galaxy NGC 5728 under subarcsec seeing conditions. In addition to the Seyfert nucleus they have found a cluster of intense giant emission line regions close to the centre of the galaxy. The velocity field of these circumnuclear gas components is highly perturbed. Some of the clouds seem to be normal giant H II regions. Others can be explained only assuming nonthermal or shock excitation. The line emission from the true, unresolved nucleus is redshifted by 245 km s-1 relative to the systemic velocity. The nucleus is surrounded by an extended (Ø ≈ 2.5 kpc), expanding (67 km s-1) ionized shell and a ring of blue continuum emission surrounding the ionized shell.
Appenzeller Immo
Wagner Stefan J.
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