Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.141d&link_type=abstract
"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199
Astronomy and Astrophysics
Astronomy
Scientific paper
We investigate the remarkable lack of Active Galactic Nuclei spectra in a sample of 27 physical galaxy pairs. Equivalent widths of absorption features are used to characterize the nuclear stellar population, and we found that most galaxies of the sample are currently forming stars. According to clasical diagnostic-diagrams, the galaxies in our sample are either classified as HII regions or have emission line-ratios near the transition zone between HII regions and LINERs; only 4 galaxies would be canditates to have a LINER-like nucleus and 1 a Seyfert 2. We assume that the spectrum of a transition object results from the simultaneous presence within the observing slit of an AGN and an HII region. To test this hypothesis we built a set of composite spectra combining the stellar population-substracted spectra of a Seyfert 1 (J 15.22), Seyfert 2 (NGC 1068) and a LINER (AM 2054-433s) with different proportions of the Gumm 38a HII region complex spectrum. The resulting models apply to 20 galaxies in the sample, suggesting that they may host a low-luminosity active nucleus.
Bonatto Ch.
Donzelli Carlos José
Pastoriza Miriani Griselda
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