Field of Streams

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The Field of Streams is a patch of sky where several stellar streams are visible and crisscross.

It was discovered by Vasily Belokurov and Daniel Zucker's team in 2006 by analyzing the Sloan Digital Sky Survey II (SDSS-II) data. The team named the area Field of Streams because of so many crisscrossing trails of stars.[1]

The Sagittarius Stream of the Sagittarius Dwarf Elliptical Galaxy (SagDEG) dominates the Field. It has a split trail within the area of the Field of Streams, because SagDEG has wrapped around the Milky Way Galaxy multiple times, which has resulted in overlapping trails. The forking of the trail has made inferences of the organization of dark matter in the inner halo of the Milky Way Galaxy possible, resulting in the determination that it is distributed in a round spherical manner, as opposed to the expected flattened spheroid. The shape of the streams also implies that the dark matter is very cold cold dark matter, due to the thin trails, and persisting existence.[2]

Also appearing in the Field is the Monoceros Ring, which was not discovered by the team which discovered the Field.[3]

See also[edit]


  1. ^ SDSS, "Multiple galaxy mergers continue in the Milky Way", 2006 May 8 (accessed 2009 March 29)
  2. ^ SpaceDaily, "Milky Way A Field Of Streams", 2006 May 9 (accessed 2009 March 29)
  3. ^ SDSS, "Map of stars in the outer regions of the Milky Way Galaxy", V. Belokurov, Sloan Digital Sky Survey (accessed 2009 March 29) Archived March 19, 2009, at the Wayback Machine.