Bulge/Disk Decompositions of S0 Galaxies With Old Outer Regions

Details Bulge/Disk Decompositions of S0 Galaxies With Old Outer Regions Bulge/Disk Decompositions of S0 Galaxies With Old Outer Regions

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543504c&link_type=abstract

American Astronomical Society, AAS Meeting #215, #435.04; Bulletin of the American Astronomical Society, Vol. 42, p.379

Astronomy and Astrophysics

Astronomy

Scientific paper

We have performed galactic component decompositions for a sample of 22 S0 galaxies using a generalized Sersic component for the bulge and an exponential profile for the disk. Our main goal is to understand the nature of S0 galaxies that have substantially old ages (> 10 Gyr) in their outer regions. Our database consists of deep optical SDSS and NIR H and J photometry of nearby S0 galaxies. We find that nearly all galaxies in our sample contain outer regions that are disk dominated. Most importantly, our results indicate that the disk component is responsible for the old ages in galaxies with old outer regions. The ages of the disks of these galaxies place a constraint on models of hierarchical merging, requiring no major merger to have occurred for these galaxies in a very long time.

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