Mapping the Bulge Metallicity Distribution Function with APOGEE

Zasowski, G.; Nidever, D. L.; Robin, A.; Schultheis, M.; Hayden, M. R.; Schiavon, R. P.; Frinchaboy, P. M.; Shetrone, M. D.; Majewski, S. R.; Allende-Prieto, C.; Johnson, J.; Cunha, K. M.; Garcia Perez, A. E.
Bibliographical reference

American Astronomical Society, AAS Meeting #223, #403.03

Advertised on:
1
2014
Number of authors
13
IAC number of authors
1
Citations
0
Refereed citations
0
Description
The origin and formation of the Milky Way bulge remains poorly understood, in part because high quality observations of the bulge have generally been restricted to regions of low extinction. In the presence of dust, infrared observations confer a distinct advantage over those at optical wavelengths, and the advent of the Apache Point Observatory Galactic Evolution Experiment (APOGEE) enables us to exploit widely this advantage for the study of the kinematics and chemistry across the entire bulge, including high extinction fields near the Galactic plane. Present APOGEE coverage includes Northern Hemisphere-accessible bulge fields spanning a 20 degree radius from the Galactic Center. The analysis of the high quality (R ~ 22,500 and a typical S/N > 100) stellar spectra from the first two years of APOGEE observations (and including data from the instrument commissioning phase) is revealing an interesting multi-dimensional view of the inner bulge and its metal distribution. We will present these new results and discuss them in the context of a bar scenario for bulge formation, as suggested by recently published observations from other surveys.