Outer disks of lenticular galaxies
classification
🌌 astro-ph.CO
keywords
galaxiesdisksouterstellaracceptedagesalongbulges
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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.
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