Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..219d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 2, Feb. 1987, p. 219-228.
Astronomy and Astrophysics
Astrophysics
25
Emission Spectra, Gas Ionization, Line Spectra, Seyfert Galaxies, Stellar Spectra, Stellar Spectrophotometry, Astronomical Maps, Charge Coupled Devices, Hydrogen Clouds, Interstellar Matter, Isophotes, Spectral Line Width
Scientific paper
Broad-band and narrow-band (mainly H-alpha and forbidden O III) observations of 11 galaxies with differing types of nuclear activity, obtained using a CCD imaging system on the 1.5-m Danish telescope at ESO during December 1983 and August 1984, are reported. The data are presented in tables and isophote maps and characterized in detail. Nine of the galaxies are shown to have diffuse ionized nebulosity extending beyond the spiral arms; the size of the nebulosity increases with the galactic optical and UV luminosity but does not depend on the level of nuclear activity or the radio loudness. It is inferred that extended cloud structures may result from intergalactic tidal interactions, and that in each galaxy the ionization mechanisms in the narrow-line region and the nebulosity are the same.
Bergeron Jacqueline
Durret Florence
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