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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607359.0, MPI für Astronomie / Publikationen_mpia
The Hercules satellite: a stellar stream in the Milky Way halo?
Authors:Jin, S.; Martin, N. F.; Prugniel, P.; Vauglin, I.
Publisher:EDP Sciences
Date of Publication (YYYY-MM-DD):2011
Title of Proceedings:CRAL-2010: A Universe of Dwarf Galaxies
Start Page:361
End Page:362
Volume (in Series):48
Name of Conference/Meeting:CRAL-2010: A Universe of Dwarf Galaxies
Audience:Not Specified
Abstract / Description:We investigate the possibility that Hercules, a recently discovered Milky Way satellite, is a stellar stream in the process of formation. This hypothesis is motivated by Hercules' highly elongated shape as well as the measurement of a tentative radial velocity gradient along its body (Adén et al. 2009a). The application of simple analytical techniques (Jin & Lynden-Bell 2007) on radial velocity data of its member stars provides tight constraints on the tangential velocity of the system (-16-22+6 kms-1, relative to the Galactic Standard of Rest). Combining this with its large receding velocity (145 km s-1) and distance (138 kpc) yields an orbit that would have taken Hercules to within 6-2+9 kpc of the Galactic centre approximately 0.6 Gyr ago. This very small perigalacticon can naturally explain the violent tidal destruction of the dwarf galaxy in the Milky Way's gravitational potential, inducing its transformation into a stellar stream.
Comment of the Author/Creator:Date: 2011, July 1, 2011
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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