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GD-1 is a moving group of old, metal-poor stars located at 8.5 kpc above the galactic disk and spanning 63 degrees across the sky, first identified in 2006.. The stream was formed after a globular cluster was disrupted by tidal forces, possibly from the gravitational field of the Milky Way. The stream is located within the Field of Streams, a region of sky in the galactic northern hemisphere containing many stellar streams, the most prominent of which is the Sagittarius stream

The stream's progenitor is believed to be a globular cluster based on the stream's radial velocity, location and the age of the stars within, but the specific cluster has not been identified.

References

1. ^ Grillmair, C. J.; Dionatos, O. (2006-05-20). "Detection of a 63° Cold Stellar Stream in the Sloan Digital Sky Survey". The Astrophysical Journal. 643 (1): L17 – L20. arXiv:astro-ph/0604332. Bibcode:2006ApJ...643L..17G. doi:10.1086/505111. ISSN 0004-637X.
2. Belokurov, V.; Zucker, D. B.; Evans, N. W.; Gilmore, G.; Vidrih, S.; Bramich, D. M.; Newberg, H. J.; Wyse, R. F. G.; Irwin, M. J.; Fellhauer, M.; Hewett, P. C.; Walton, N. A.; Wilkinson, M. I.; Cole, N.; Yanny, B. (2006-05-10). "The Field of Streams: Sagittarius and Its Siblings". The Astrophysical Journal. 642 (2): L137 – L140. arXiv:astro-ph/0605025. Bibcode:2006ApJ...642L.137B. doi:10.1086/504797. ISSN 0004-637X.

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