Dec 12, 2013

Brett Andrews, The Ohio State University

"Decoding Galactic Chemical Evolution with Gas-phase and Stellar Abundances"

Speaker's website »

Gas-phase and stellar chemical abundances are sensitive and complementary
diagnostics of the main processes that drive galaxy evolution. Galaxy gas-
phase metallicities are tightly correlated with stellar mass, but previous
mass-metallicity relations suffered from large systematic uncertainties in
the metallicity measurements.  I will show results from our recent determination
of the mass-metallicity relation from stacked SDSS spectra whose high
signal-to-noise ratio enabled the detection of the weak auroral lines that are
necessary for measuring metallicity with the more reliable direct method. I
will also explore the potential of next generation stellar abundance
surveys, such as APOGEE, which will measure the abundances of 10-20 elements for at
least 100,000 stars. These data sets will require more advanced analysis
techniques to interpret the wealth of available information. I will discuss
one such tool, Principal Component Abundance Analysis, and demonstrate its
usefulness in applications to existing data sets and chemical evolution

Event Details

Dec 12, 2013


4421 Sterling Hall

Coffee served at 3:30pm; talk starts at 3:45pm

Speaker Host:
Elena D'Onghia

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