Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1449k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Aug. 1985, p. 1449-1456.
Astronomy and Astrophysics
Astronomy
8
Active Galaxies, Astronomical Spectroscopy, Galactic Evolution, Galactic Nuclei, Galactic Structure, Optical Emission Spectroscopy, Seyfert Galaxies, Astronomical Photometry, Elliptical Galaxies, Galactic Rotation, Jets, Radio Astronomy, Stellar Spectra, Tides
Scientific paper
Spectroscopic, imaging, and radio observations of the tidally disturbed active systems VV 144 and I Zw 96 are presented, and indicate that the prominent optical extensions seen in both cases represent tidal tails rather than matter ejected from their nuclei (jets). This conclusion is based on the presence of stellar spectral features in the tails, lack of significant ionized gas over most of their length, and lack of radio emission outside the nuclei. Discrete knots in these tails are identified with remnant cores of the companion galaxies responsible for the morphological disturbances of the main galaxies and perhaps contributing to their nuclear activity. In both cases, the dynamics of the interactions are unusual in nature or viewing geometry. VV 144 is seen in the common plane of interaction and disk rotation, appearing strongly foreshortened. I Zw 96 shows tails associated with two companions; each is accompanied by changes in tail structure. This may be the result of a binary system of spirals colliding with a giant elliptical galaxy.
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