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Kinematic transitions and streams in galaxy halos

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arxiv 1401.7673 v1 pith:WTSSX3VZ submitted 2014-01-29 astro-ph.GA astro-ph.CO

Kinematic transitions and streams in galaxy halos

A.J. Romanowsky , J.A. Arnold , J.P. Brodie , C. Foster , D.A. Forbes , H. Lux , D. Martinez-Delgado , J. Strader
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S. Zibetti the SLUGGS team
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classification astro-ph.GA astro-ph.CO
keywords galaxyhalosstellartracerallowalongapproacharound
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The chemo-dynamics of galaxy halos beyond the Local Group may now be mapped out through the use of globular clusters and planetary nebulae as bright tracer objects, along with deep multi-slit spectroscopy of the integrated stellar light. We present results from surveying nearby early-type galaxies, including evidence for kinematically distinct halos that may reflect two-phase galaxy assembly. We also demonstrate the utility of the tracer approach in measuring the kinematics of stellar substructures around the Umbrella Galaxy, which allow us to reconstruct the progenitor properties and stream orbit.

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