IFU Spectroscopy of Galaxy Truncation

Details IFU Spectroscopy of Galaxy Truncation IFU Spectroscopy of Galaxy Truncation

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535405y&link_type=abstract

American Astronomical Society, AAS Meeting #215, #354.05; Bulletin of the American Astronomical Society, Vol. 42, p.537

Physics

Scientific paper

We have used the VIRUS-P spectrograph to obtain IFU spectroscopy of a sample of 10 nearby disk galaxies. We observe galaxies that show a mix of radial surface brightness profiles (i.e, downbending truncation regions and upturns). Because VIRUS-P is currently the largest field-of-view spectrograph, and has large 4.3" diameter fibers, we are able to spectroscopically measure stellar ages and metallicities down to very low surface brightness levels (muv 24 mag/sq arcsec). We have combined Bruzual & Charlot models with the GANDALF spectral fitting code to measure robust average ages of disk galaxy stellar populations. Simulations have shown that surface brightness truncations could be caused by stellar migration, implying that stars beyond the break should be older and metal poor. While we find a few examples of the expected behavior, in general there seems to be little correlation with stellar population parameters and a galaxy's surface brightness profile implying the physics of star formation is decoupled from the mechanism creating surface brightness profile breaks.

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