Abstract / Description of output
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 ~10° 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.
Original language | English |
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Pages (from-to) | 80 |
Journal | Astrophysical Journal |
Volume | 750 |
Issue number | 1 |
DOIs | |
Publication status | Published - 17 Apr 2012 |
Keywords / Materials (for Non-textual outputs)
- galaxies: dwarf
- galaxies: individual: Sagittarius
- Local Group