Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238...15d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 15-27.
Astronomy and Astrophysics
Astrophysics
18
Active Galactic Nuclei, Ionized Gases, Seyfert Galaxies, Turbulence Effects, Accretion Disks, Astronomical Spectroscopy, Emission Spectra, Forbidden Bands, Interstellar Matter, Northern Sky
Scientific paper
New medium-high resolution long-slit spectroscopic data are used to derive kinematical properties, analyze line profiles, and map emission line ratios for a sample of 20 northern hemisphere extended ionized nebulosities, 11 of which are detected for the first time. The ratio of the FWHM of the forbidden O III 5007 emission line in the extranuclear regions to the maximum amplitude of the velocity field is shown to be larger than one in a number of cases, suggesting important turbulent motions which may be due to accretion of matter from a nearby galaxy or from the intergalactic medium and which may give a clue to the origin of such extended envelopes.
Durret Florence
Warin F.
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