Sagittarius Debris, the Virgo Stellar Stream, and the new stream near the Galactic Plane

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Scientific paper

We present spatial positions of stars in the leading and trailing tidal tails of the Sagittarius dwarf galaxy debris. We show that the Sgr tidal tails do not explain the overdensity of stars in the direction of what has been named the Virgo Stellar Stream. The Virgo Stellar Stream is probably gravitationally unbound debris from another dwarf galaxy disruption. It covers 300 sq. deg. of sky, with a diameter of 10 kpc and a stellar mass of roughly 5 x 105 MSun. We demonstrate a new technique of using the color of a stellar population's turnoff to distinguish between structures which may overlap in space. This technique allowed us to clearly separate a new tidal debris stream that is slightly closer, has a bluer turnoff, and is much smaller than the Monoceros stream in the Galactic plane. Funding from the National Science Foundation AST 03-07571, AST 06-07618, and the NASA Space Grant.

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