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Title: THE DATA REDUCTION PIPELINE FOR THE APACHE POINT OBSERVATORY GALACTIC EVOLUTION EXPERIMENT

The Apache Point Observatory Galactic Evolution Experiment (APOGEE), part of the Sloan Digital Sky Survey III, explores the stellar populations of the Milky Way using the Sloan 2.5-m telescope linked to a high resolution (R ∼ 22,500), near-infrared (1.51–1.70 μm) spectrograph with 300 optical fibers. For over 150,000 predominantly red giant branch stars that APOGEE targeted across the Galactic bulge, disks and halo, the collected high signal-to-noise ratio (>100 per half-resolution element) spectra provide accurate (∼0.1 km s{sup −1}) RVs, stellar atmospheric parameters, and precise (≲0.1 dex) chemical abundances for about 15 chemical species. Here we describe the basic APOGEE data reduction software that reduces multiple 3D raw data cubes into calibrated, well-sampled, combined 1D spectra, as implemented for the SDSS-III/APOGEE data releases (DR10, DR11 and DR12). The processing of the near-IR spectral data of APOGEE presents some challenges for reduction, including automated sky subtraction and telluric correction over a 3°-diameter field and the combination of spectrally dithered spectra. We also discuss areas for future improvement.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ; ;  [5] ;  [6] ; ; ; ; ; ; ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12]
  1. Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 (United States)
  2. New Mexico State University, Las Cruces, NM 88003 (United States)
  3. Instituto de Astrofísica de Canarias, Via Láctea s/n, E-38205 La Laguna, Tenerife (Spain)
  4. Laboratory for Atmospheric and Space Sciences, University of Colorado at Boulder, Boulder, CO (United States)
  5. Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802 (United States)
  6. Apache Point Observatory and New Mexico State University, P.O. Box 59, sunspot, NM 88349-0059 (United States)
  7. Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325 (United States)
  8. Computer Sciences Corporation, 3700 San Martin Dr, Baltimore, MD 21218 (United States)
  9. Department of Astronomy and the Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210 (United States)
  10. Department of Astronomy and Astrophysics, University of Toronto, Toronto, Ontario, M5S 3H4 (Canada)
  11. Gemini Observatory, 670 N. A’Ohoku Place, Hilo, HI 96720 (United States)
  12. University of Texas at Austin, McDonald Observatory, Fort Davis, TX 79734 (United States)
Publication Date:
OSTI Identifier:
22520087
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 150; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION SPECTROSCOPY; CORRECTIONS; DATA ANALYSIS; ELEMENT ABUNDANCE; EMISSION SPECTROSCOPY; GALACTIC EVOLUTION; IMAGE PROCESSING; MILKY WAY; NEAR INFRARED RADIATION; OPTICAL FIBERS; RED GIANT STARS; RESOLUTION; SIGNAL-TO-NOISE RATIO; TELESCOPES