SEGUE-2 and APOGEE: Revealing the History of the Milky Way

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dc.creatorRockosi, Constance
dc.creatorBeers, Timothy C.
dc.creatorMajewski, Steven
dc.creatorSchiavon, Ricardo
dc.creatorEisenstein, Daniel
dc.creatorCollaboration, with input from the SDSS-III
dc.date2009-02-19
dc.date.accessioned2026-07-07T12:44:56Z
dc.date.available2026-07-07T12:44:56Z
dc.descriptionThe history of the Milky Way is encoded in the spatial distributions, kinematics, and chemical enrichment patterns of its resolved stellar populations. SEGUE-2 and APOGEE, two of the four surveys that comprise SDSS-III (the Sloan Digital Sky Survey III), will map these distributions and enrichment patterns at optical and infrared wavelengths, respectively. Using the existing SDSS spectrographs, SEGUE-2 will obtain spectra of 140,000 stars in selected high-latitude fields to a magnitude limit r ~ 19.5, more than doubling the sample of distant halo stars observed in the SDSS-II survey SEGUE (the Sloan Extension for Galactic Understanding and Exploration). With spectral resolution R ~ 2000 and typical S/N per pixel of 20-25, SEGUE and SEGUE-2 measure radial velocities with typical precision of 5-10 km/s and metallicities ([Fe/H]) with a typical external error of 0.25 dex. APOGEE (the Apache Point Observatory Galactic Evolution Experiment) will use a new, 300-fiber H-band spectrograph (1.5-1.7 micron) to obtain high-resolution (R ~ 24,000), high signal-to-noise ratio (S/N ~ 100 per pixel) spectra of 100,000 red giant stars to a magnitude limit H ~ 12.5. Infrared spectroscopy penetrates the dust that obscures the inner Galaxy from our view, allowing APOGEE to carry out the first large, homogeneous spectroscopic survey of all Galactic stellar populations. APOGEE spectra will allow radial velocity measurements with < 0.5 km/s precision and abundance determinations (with ~ 0.1 dex precision) of 15 chemical elements for each program star, which can be used to reconstruct the history of star formation that produced these elements. (abridged)
dc.descriptionUnpublished SDSS-III white paper for the US Decadal Survey. See http://www.sdss3.org for details of the international SDSS-III project
dc.identifierhttps://arxiv.org/abs/0902.3484
dc.identifierhttp://arxiv.org/abs/0902.3484
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220943
dc.subjectAstrophysics of Galaxies
dc.subjectSolar and Stellar Astrophysics
dc.titleSEGUE-2 and APOGEE: Revealing the History of the Milky Way
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