Outer disks of lenticular galaxies
arXiv:1112.3771 · doi:10.1017/S1743921312009180
Abstract
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.
Proceedings of the IAU Symp. 284 "The Spectral Energy Distribution of Galaxies", Preston (UK), September 2011, eds. R. J. Tuffs and C. C. Popescu