2012ApJ...760L...6B -
Astrophys. J., 760, L6 (2012/November-3)
A cold Milky Way stellar stream in the direction of Triangulum.
BONACA A., GEHA M. and KALLIVAYALIL N.
Abstract (from CDS):
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 0°.2 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.
Abstract Copyright:
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Journal keyword(s):
Galaxy: halo - Galaxy: structure
Nomenclature:
NAME Triangulum Stream N=1.
Simbad objects:
13
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