The Sagittarius Streams in the Southern Galactic Hemisphere

1); 2); (2) Sternberg Astronomical Institute; 3); (3) Sydney Institute for Astronomy; (4) Kavli Institute for Astronomy; (5) Apache Point Observatory; (6) Pennsylvania State University; (7) The Johns Hopkins University; (8) Instituto de Astrofisica de Andalucia

The Sagittarius Streams in the Southern Galactic Hemisphere

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arxiv 1111.7042 v2 pith:DM2S4CYJ submitted 2011-11-30 astro-ph.GA astro-ph.CO

The Sagittarius Streams in the Southern Galactic Hemisphere

Sergey E. Koposov (1 , 2) , V. Belokurov (1) , N. W. Evans (1) , G. Gilmore (1) , M. Gieles (1) , M. J. Irwin (1) , G. F. Lewis (1

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3) M. Niederste-Ostholt (1) J. Penarrubia (8 1) M. C. Smith (4) D. Bizyaev (5 E. Malanushenko (5) V. Malanushenko (5) D. P. Schneider (6) R. F. G. Wyse (7) ((1) Institute of Astronomy Cambridge UK (2) Sternberg Astronomical Institute Moscow Russia (3) Sydney Institute for Astronomy Australia (4) Kavli Institute for Astronomy Astrophysics Beijing China (5) Apache Point Observatory Sunspot USA (6) Pennsylvania State University (7) The Johns Hopkins University Baltimore (8) Instituto de Astrofisica de Andalucia Granada Spain)

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keywords streamsagittariusgalacticbluecetusdatafainterhemisphere

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The structure of the Sagittarius stream in the Southern Galactic hemisphere is analysed with the Sloan Digital Sky Survey Data Release 8. Parallel to the Sagittarius tidal track, but ~ 10deg 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 colour-magnitude diagram with multiple turn-offs 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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Cited by 1 Pith paper

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Neighbors, Not Kin: Kinematic evidence for tidal tails from NGC 7492 along the Sagittarius stream
astro-ph.GA 2026-07 accept novelty 6.0

GIRAFFE radial velocities and metallicities confirm NGC 7492 tidal tails extending ≥1.8 deg, kinematically and chemically distinct from the overlapping Sagittarius stream.