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More evidence of substructure in the motions of nearby halo stars

Published online by Cambridge University Press:  06 October 2004

P. Re Fiorentin
Affiliation:
Dipartimento di Fisica Generale, Università di Torino, Via Pietro Giuria 1, 10125 Torino, I, email: [email protected]
A. Helmi
Affiliation:
Kapteyn Instituut, P.O. BOX 800, 9700 AV Groningen, NL
M. G. Lattanzi
Affiliation:
INAF, Osservatorio Astronomico di Torino, Via Osservatorio 20, 10025 Pino Torinese, I
A. Spagna
Affiliation:
INAF, Osservatorio Astronomico di Torino, Via Osservatorio 20, 10025 Pino Torinese, I
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Abstract

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We explore the stellar halo of the Milky Way to search for fossil signatures of past mergers. We use the Beers et al. (2000) catalog of non-kinematically selected metal poor stars in the solar neighborhood to select subsets of halo stars within 1-2 kpc of the Sun. Motivated by the results of high resolution CDM simulations, we look for substructure in the kinematics of the fastest stars. When a two-point velocity correlation function is applied to these subsets, statistical evidence of substructure is found. This appears to be due to a small moving group with dynamical properties similar to the stellar “stream” previously discovered by Helmi et al. (1999).To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Copyright
© 2004 International Astronomical Union