APOGEE: Probing the Evolution of the Milky Way

APO Galactic Evolution Experiment (APOGEE)

APOGEE at a Glance:

  • Bright time observations
  • Spring 2011 – Spring 2014
  • 100,000 giant stars to magnitude H=12.2
  • Resolution R~22,500, typical S/N > 100
  • Wavelengths 1.51-1.70 μm
  • Stellar parameters including log(g), Teff, [Fe/H], [α/Fe]
  • Abundance of 15 chemical species to 0.1 dex precision
  • Velocity error < 100 m/s

For a detailed description of APOGEE, see section 5 of the Project Description, available as a PDF document.

The APO Galactic Evolution Experiment (APOGEE) employs high-resolution, high signal-to-noise infrared spectroscopy to penetrate the dust that obscures significant fractions of the disk and bulge of our Galaxy. APOGEE surveys over 100,000 red giant stars across the full range of the Galactic bulge, bar, disk, and halo. APOGEE generates precise radial velocities and detailed chemical abundances, providing unprecedented insights into the dynamical structure and chemical history of the Galaxy. In conjunction with the planet-finding surveys, Kepler and CoRoT, APOGEE unravels problems in fundamental astrophysics.

The SEGUE-2 and APOGEE datasets will play a central role in near-field cosmology tests of galaxy formation and the small-scale distribution of dark matter.

IR map of the whole Galaxy showing the plane and bulge of the Galaxy full of stars and dust. APOGEE uses new IR instrumentation to study stars within the disk and is less affected by the extinction from interstellar dust.
IR map of the whole Galaxy showing the plane and bulge of the Galaxy full of stars and dust. APOGEE uses new IR instrumentation to study stars within the disk and is less affected by the extinction from interstellar dust.

Working with APOGEE data

Data Release 13 is the latest public release of APOGEE spectra, which includes newly reduced spectra and new and improved abundances.

  • An overview of the APOGEE data available is available here.
  • There are some examples available for accessing and viewing APOGEE data.
  • There are descriptions of the target selection for APOGEE stars.

APOGEE papers

APOGEE has submitted and/or published several papers which are listed on the SDSS-III APOGEE Publications page.