Star formation history at the centers of lenticular galaxies with bars and purely exponential outer disks from SAURON data |
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| Authors: | O K Sil’chenko I V Chilingarian |
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| Institution: | 1.Sternberg Astronomical Institute,Moscow,Russia;2.Strasbourg Observatory,CNRS UMR,Strasbourg,France |
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| Abstract: | We have investigated the stellar population properties in the central regions of a sample of lenticular galaxies with bars
and single-exponential outer stellar disks using the data from the SAURON integral-field spectrograph retrieved from the open
Isaac Newton Group Archive. We have detected chemically decoupled compact stellar nuclei with a metallicity twice that of
the stellar population in the bulges in seven of the eight galaxies. A starburst is currently going on at the center of the
eighth galaxy and we have failed to determine the stellar population properties from its spectrum. The mean stellar ages in
the chemically decoupled nuclei found range from 1 to 11 Gyr. The scenarios for the origin of both decoupled nuclei and lenticular
galaxies as a whole are discussed. |
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