期刊
ASTROPHYSICAL JOURNAL
卷 750, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/750/1/80
关键词
galaxies: dwarf; galaxies: individual (Sagittarius); Local Group
资金
- Science and Technology Funding Council of the United Kingdom
- Royal Society
- Australian Research Council [FT100100268, DP110100678]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy Office of Science
- Science and Technology Facilities Council [ST/H004157/1, ST/J000647/1, ST/H004165/1, ST/J00541X/1, ST/J001538/1, ST/H00243X/1, PP/C002229/1] Funding Source: researchfish
- STFC [ST/H004157/1, ST/J001538/1, ST/J00541X/1, PP/C002229/1, ST/H004165/1, ST/J000647/1] Funding Source: UKRI
The structure of the Sagittarius stream in the southern Galactic hemisphere is analyzed with the Sloan Digital Sky Survey Data Release 8. Parallel to the Sagittarius tidal track, but similar to 10 degrees away, there is another fainter and more metal-poor stream. We provide evidence that the two streams follow similar distance gradients but have distinct morphological properties and stellar populations. The brighter stream is broader, contains more metal-rich stars, and has a richer color-magnitude diagram with multiple turnoffs and a prominent red clump as compared to the fainter stream. Based on the structural properties and the stellar population mix, the stream configuration is similar to the Northern bifurcation. In the region of the South Galactic Cap, there is overlapping tidal debris from the Cetus stream, which crosses the Sagittarius stream. Using both photometric and spectroscopic data, we show that the blue straggler population belongs mainly to Sagittarius and the blue horizontal branch stars belong mainly to the Cetus stream in this confused location in the halo.
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