Structure in the motions of the fastest halo stars

Structure in the motions of the fastest halo stars

We analyzed the catalog published by Beers et al. (2000, ApJ, 119, 2866) of 2106 non-kinematically selected metal poor stars in the solar neighborhood, with the goal of quantifying the amount of substructure in the motions of the fastest halo stars. We computed the two-point velocity correlation fun...

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Veröffentlicht in:Astronomy and astrophysics (Berlin) 2005-08, Vol.439 (2), p.551-558
Hauptverfasser: Re Fiorentin, P., Helmi, A., Lattanzi, M. G., Spagna, A.
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Galaxy: formation
Galaxy: halo
Galaxy: kinematics and dynamics
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container_issue 2
container_start_page 551
container_title Astronomy and astrophysics (Berlin)
container_volume 439
creator Re Fiorentin, P.
Helmi, A.
Lattanzi, M. G.
Spagna, A.
description We analyzed the catalog published by Beers et al. (2000, ApJ, 119, 2866) of 2106 non-kinematically selected metal poor stars in the solar neighborhood, with the goal of quantifying the amount of substructure in the motions of the fastest halo stars. We computed the two-point velocity correlation function for a subsample of halo stars within 1–2 kpc of the Sun, and found statistical evidence of substructure with a similar amplitude to that predicted by high resolution CDM simulations. The signal is due to a small kinematic group whose dynamical properties are compared to the stellar “stream” previously discovered by Helmi et al. (1999). If real, this high velocity moving group would provide further support for the idea that substructures remain as fossils from the formation of the Galaxy as expected in the CDM scenario.
doi_str_mv 10.1051/0004-6361:20052911
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source Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; EDP Sciences; EZB-FREE-00999 freely available EZB journals
subjects Galaxy: formation
Galaxy: halo
Galaxy: kinematics and dynamics
title Structure in the motions of the fastest halo stars
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