Beyond the Break: Observational Evidence of Stellar Migration

Details Beyond the Break: Observational Evidence of Stellar Migration Beyond the Break: Observational Evidence of Stellar Migration

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934612y&link_type=abstract

American Astronomical Society, AAS Meeting #219, #346.12

Astronomy and Astrophysics

Astronomy

Scientific paper

We use the VIRUS-P IFU spectrograph to observe 6 nearby disk galaxies. In three cases (NGC 2684, NGC 6155, and NGC 7437), we find that a downward break in the disk surface brightness profile corresponds with a change in the dominant stellar population with the interior being dominated by active star formation and the exterior having older stellar populations. This is similar to theoretical models that predict surface brightness breaks are caused by stellar migration, with the outer disk being populated from scattered old interior stars.
In three more cases (IC 1132, NGC 4904, and NGC 6691), we find no significant change in the stellar population as one crosses the break radius. In these galaxies, both the inner and outer disks are dominated by active star formation and younger stellar populations. While radial migration can contribute to radial profile breaks, it appears multiple mechanisms are required to explain all of our observed stellar profile breaks.

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