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Substructure in tidal streams: Tributaries in the anticenter stream

Grillmair, C. J. (2006) Substructure in tidal streams: Tributaries in the anticenter stream. Astrophysical Journal Letters, 651 (1). L29-L32. ISSN 2041-8205.

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We report on the detection in Sloan Digital Sky Survey data of at least three, roughly parallel components in a 65°-long, stellar stream complex previously identified with the Monoceros Ring. The three-stream complex varies in width from 4° to 6° along its length and appears to be made up of two or more narrow substreams as well as a broader, diffuse component. The width and complexity of the stream indicate that the progenitor was likely a dwarf galaxy of significant size and mass. The stream is 8.9 kpc distant and is oriented almost perpendicularly to our line of sight. The visible portion of the stream does not pass near any known dwarf galaxies, and a preliminary orbit does not point to any viable progenitor candidates. Orbits for the narrower substreams can be modeled with velocity offsets from the broad component of ≈8 km s^-1. We suggest that the broad component is likely to be the remains of a dwarf galaxy, while the narrower streams constitute the remnants of dynamically distinct components that may have included a native population of globular clusters. While the color of the main-sequence turnoff is not unlike that for the Monoceros Ring, neither the visible stream nor any reasonable projection of its orbit passes through Monoceros or Canis Major, and we conclude that this stream is probably unrelated to the overdensities found in these regions.

Item Type:Article
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Grillmair, C. J.0000-0003-4072-169X
Additional Information:© 2006 American Astronomical Society. Received 2006 August 18; accepted 2006 September 14; published 2006 October 10. Print publication: Issue 1 (2006 November 1). This work was begun at the 2006 workshop on Deconstructing the Local Group, and the author is grateful to the Aspen Center for Physics for their hospitality. Funding for the creation and distribution of the SDSS Archive has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Aeronautics and Space Administration, the National Science Foundation, the US Department of Energy, the Japanese Monbukagakusho, and the Max Planck Society. Facilities: Sloan
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Participating InstitutionsUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Japanese MonbukagakushoUNSPECIFIED
Max Planck SocietyUNSPECIFIED
Subject Keywords:galaxy: halo; galaxy: structure
Issue or Number:1
Record Number:CaltechAUTHORS:GRIapjl06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12573
Deposited By: Tony Diaz
Deposited On:15 Jan 2009 06:30
Last Modified:03 Oct 2019 00:29

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