Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21336206p&link_type=abstract
American Astronomical Society, AAS Meeting #213, #362.06; Bulletin of the American Astronomical Society, Vol. 41, p.513
Other
Scientific paper
The origin of S0 galaxies is a cornerstone of galaxy formation models. This work is a study of the mechanisms involved in the formation and
evolution of S0 galaxies through the analysis of radial trends in stellar populations extending far into the galaxies' outskirts. Our analysis is based on new, deep, optical and NIR imaging of a large sample of S0 galaxies covering a wide range of properties. Color gradients, computed from SDSS griz and UH2.2m J & H band imaging beyond 4.5 Re, are matched with stellar population models to derive population ages and metallicity gradients. These trends are compared amongst galaxies
of varying properties. The changes in stellar populations with galaxy components (bulge/disk/halo), environment, galaxy mass, concentration, and other structural properties will provide formation models with critical constraints. Intriguingly, we find that ages increase substantially with radius for a large sub-sample of S0 galaxies. In fact, in approximately 25% of our sample, the population age of the galaxies increases by more than 8 Gyr from the center out. We provide tentative interpretations for this and other observed trends, in the context of current galaxy formation scenarios.
Courteau Stephane
McDonald Michael
Prochaska Leslie C.
Rose James A.
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