A Cold Milky Way Stellar Stream in the Direction of Triangulum
Abstract
We present evidence for a new Milky Way stellar tidal stream in the direction of the Andromeda and Triangulum (M31 and M33) galaxies. Using a matched-filter technique, we search the Sloan Digital Sky Survey Data Release 8 by creating stellar density maps which probe the Milky Way halo at distances between 8 and 40 kpc. A visual search of these maps recovers all of the major known stellar streams, as well as a new stream in the direction of M31/M33 that we name the Triangulum stream. The stream spans 0fdg2 by 12° on the sky, or 75 pc by 5.5 kpc in physical units with a best-fitting distance of 26 ± 4 kpc. The width of the stream is consistent with being the tidal remnant of a globular cluster. A color-magnitude diagram of the stream region shows an overdensity which, if identified as a main-sequence turnoff, corresponds to an old (~12 Gyr) and metal-poor ([Fe/H] ~-1.0 dex) stellar population. Future kinematic studies of this and similar cold streams will provide tight constraints on the shape of the Galactic gravitational potential.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2012
- DOI:
- 10.1088/2041-8205/760/1/L6
- arXiv:
- arXiv:1209.5391
- Bibcode:
- 2012ApJ...760L...6B
- Keywords:
-
- Galaxy: halo;
- Galaxy: structure;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 6 pages, 4 figures