Two elliptical galaxies with active nuclei - NGC 6212 and MKN 501

Astronomy and Astrophysics – Astronomy

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Elliptical Galaxies, Galactic Nuclei, H Alpha Line, Iron, Magnesium, Seyfert Galaxies, Spectrophotometry

Scientific paper

Spectrophotometric data for the elliptical galaxies NGC 6212 and Mkn 501, as well as UBVRI photometry for Mkn 501, are presented. Both galaxies are known to harbor active nuclei. The Seyfert 1 nature of the nucleus of NGC 6212 is confirmed, and it is argued that the extended emission in that galaxy could be due to recent star formation in it. Emission features have been detected at the center of Mkn 501, suggesting the presence of Seyfert-like activity in the nucleus. Both galaxies show early-type stellar absorption features, and some of their metallicity indicators are peculiar when compared with those of elliptical galaxies in Formax. In particular, the strengths of the magnesium and iron features are very high. The photometric UBVRI data for Mkn 501 show small amplitude variations which become more important in the I band.

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