The Outer Milky Way: SEGUE-II
| SEGUE-II at a glance |
- Dark time observations, Fall 2008 - Spring 2009
- 1,000-fiber spectrograph, resolution R~2000
- wavelengths 385-920 nm
- Velocity error 4 km/s, [Fe/H] error 0.3 dex
- Bright time parallel program, 2010-2014, 100,000 stars to g=17
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SEGUE-II will map the outer Milky Way with spectra of 250,000 stars, doubling the sample of the SEGUE (Sloan
Extension for Galactic Understanding and Exploration) component of SDSS-II. These measurements reveal the
complex kinematic and chemical substructure of the Galactic halo and disks, providing essential clues to the
assembly and enrichment history of the Galaxy. They uncover rare, chemically primitive stars that are fossils of
the earliest generations of cosmic star formation.
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| SDSS stellar map of the northern sky, showing trails and streams of stars torn from
disrupted Milky Way satellites. Insets show new dwarf companions discovered by the SDSS (credit: V. Belokurov). |
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