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Kinematic Discovery of a Stellar Stream Located in Pisces

Martin, Charles and Carlin, Jeffrey L. and Newberg, Heidi Jo and Grillmair, Carl J. (2013) Kinematic Discovery of a Stellar Stream Located in Pisces. Astrophysical Journal Letters, 765 (2). Art. No. L39. ISSN 2041-8205.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Carlin, Jeffrey L.0000-0002-3936-9628
Grillmair, Carl J.0000-0003-4072-169X
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
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:Galaxy: kinematics and dynamics – Galaxy: stellar content – Galaxy: structure
Issue or Number:2
Record Number:CaltechAUTHORS:20130405-094814897
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Official Citation:Kinematic Discovery of a Stellar Stream Located in Pisces Charles Martin et al. 2013 ApJ 765 L39
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37780
Deposited By: Tony Diaz
Deposited On:08 Apr 2013 22:08
Last Modified:09 Mar 2020 22:56

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