Spectroscopic observations of Arp-Madore interacting galaxies. I - Pairs of comparably sized galaxies

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Galactic Nuclei, Galactic Structure, H Ii Regions, Interacting Galaxies, Seyfert Galaxies, Emission Spectra, Infrared Astronomy Satellite, Line Spectra, Radial Velocity, Star Formation Rate

Scientific paper

Nuclear spectra of 129 galaxies from a sample of 71 pairs of interacting doubles of comparably sized galaxies have been analyzed on the basis of IRAS observations. Data obtained include radial velocities, relative emission-line intensity measurements, and optical classifications. It is confirmed that a large number of these objects are indeed showing H II region type spectra. It is suggested that a low LINER detection rate could be due to the IR criteria which favor a strong H II region type activity and make it difficult to detect low-level LINER activity which may be present. The excess of Seyfert-type nuclei was not found, and the reason remains unclear. A high-frequency of one-sided enhanced star-formation activity, suggested by the far-infrared study of the same sample of galaxies, also was not found. The enhancement of the star-formation activity more likely to take place in both galaxies, but the strength and/or time-scale and phase of the activity in each of the two galaxies of the pair may differ substantially.

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