Kinematic Discovery of a Stellar Stream Located in Pisces
Abstract
We report the kinematic discovery of the Pisces Stellar Stream (PSS), at Galactic longitude l ≈ 135° and –39° < b < –36°. We originally identified this halo substructure from velocities of red giant branch stars in the Sloan Digital Sky Survey (SDSS) Data Release 8, and confirmed its presence in turnoff stars from SDSS photometric data. The PSS is a narrow, kinematically cold tidal stream, with σ_(v, 0) ≈ 8 km s^(–1). Its metallicity is [Fe/H] ≈ –2.2, with ~0.3 dex dispersion. The color-magnitude signature of the stream turnoff, combined with our measured metallicity, places the PSS at a distance of 35 ± 3 kpc. The PSS is the same as the previously announced "Triangulum stream" and part of the proposed "stream a." We rule out an association of the PSS with other previously known Milky Way substructures in the same region of the sky.
Additional Information
© 2013 The American Astronomical Society. Received 2012 November 8; accepted 2013 February 5; published 2013 February 25. We thank the anonymous referee for insightful comments. This work was supported by NSF grants AST 09-37523, AST 10-09670, and AST 12-39904. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the US Department of Energy Office of Science. The SDSS-III Web site is http://www.sdss3.org/.Attached Files
Published - 2041-8205_765_2_L39.pdf
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Additional details
- Eprint ID
- 37780
- Resolver ID
- CaltechAUTHORS:20130405-094814897
- AST-0937523
- NSF
- AST-1009670
- NSF
- AST-1239904
- NSF
- Alfred P. Sloan Foundation
- Department of Energy (DOE)
- Created
-
2013-04-08Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)