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Outer disks of lenticular galaxies

By studying the stellar population properties along the radius in 15 nearby S0 galaxies, I have found that the outer stellar disks are mostly old, with the SSP-equivalent ages of 8-15 Gyr, being often older than the bulges. This fact puts into doubt a currently accepted paradigm that S0 galaxies have formed at z=0.4 by quenching star formation in spiral galaxies.

preprint2011arXivOpen access
Olga K. Sil'chenko
astro-ph.CO
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Open access1 author1 topic
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Olga K. Sil'chenko

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