Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347...55p&link_type=abstract
Astronomy and Astrophysics, v.347, p.55-62 (1999)
Astronomy and Astrophysics
Astrophysics
11
Galaxies: Active, Galaxies: Interactions, Galaxies: Nuclei, Galaxies: Stellar Content
Scientific paper
In this paper we investigate the nuclear activity and stellar population in a sample of 27 physical galaxy pairs. Equivalent widths of absorption features are used to characterise the nuclear stellar population according to templates: most galaxies of the sample have important flux contributions from stars younger than 10(8) years. According to classical diagnostic-diagrams the galaxies in our sample are either classified as H II regions or have emission line ratios near the transition zone between H II regions and LINERs. Based on the observed spectra, only 4 galaxies show LINER properties and 1 nucleus is a Seyfert 2. We found that the spectrum of a transition object (38% of the sample) can be described by a combination of an AGN with an H II region. As a result, 20 galaxies of the present sample may host a low-luminosity active nucleus. Based on observations made at CASLEO and CTIO. Complejo Astronómico El Leoncito (CASLEO) is operated under agreement between the Consejo Nacional de Investigaciones Cient\'\i ficas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba and San Juan.
Bonatto Ch.
Donzelli Carlos José
Pastoriza Miriani Griselda
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