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• W1489722476 abstract "Observing six-dimensional positions and velocities of halo stars allows them to be plotted in the space of adiabatic invariants. This integral space information survives on timescales over which spacial coherence is lost, providing the ability to trace field halo stars as being debris from accreted satellites. We provide here a survey of accreted satellites in the halo of the Galaxy that have been detected using these techniques. We further explore the possibility of chemical abundances being used to provide further evidence for these streams being debris of disrupted building blocks of the Galactic stellar halo. 1. Halo Stars in Phase Space The present day chemical and dynamical properties of the Milky Way bear the imprint of the Galaxy’s formation and evolutionary history. In seeking a detailed physical understanding of the Milky Way’s formation, we hope that kinematic and chemical properties can be used as tags which associate them with particular proto-Galactic building blocks and evolutionary processes. Observations of considerable substructure in the halo provide evidence in support of satellite accretion during our Galaxy’s formation (e.g., Ibata, Gilmore, & Irwin 1994; Majewski, Munn, & Hawley 1996; Helmi et al. 1999; Chiba & Beers 2000, hereafter CB00; Dinescu 2002; Ibata et al. 2003; Brook, Kawata, & Gibson 2003). Helmi & White (1999) noted that satellites disrupted several billions years ago will not retain the spatial correlations required to allow identification. However, they showed that the trail of stars left by a disrupted dwarf satellite will retain strong correlations in velocity space. Six-dimensional position, velocity space information, along with Galactic potential estimates, allow calculation of the integrals of motion (E, L, Lz). These are conserved quantities and hence should evolve only slightly within the relatively stable potential of a galaxy after its halo is virialized. This space of adiabatic invariants is a natural space to search for signatures of an accretion event (e.g., Helmi & de Zeeuw 2000). Figure 1. shows phase space plots of halo stars of the Chiba & Beers (2000) catelogue which have been identified as being from disrupted satellites. The first three panels of Figure 1 are velocity projections: velocity directed radially away from the Galactic Center, Vrad, versus rotational velocity in the plane of the disk Vφ; velocity out of the plane Vz versus Vφ; and Vrad versus Vz. The fourth panel plots the integrals of motion, projected angular momentum Lz versus the absolute value of the energy (|E|)." @default.
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• W1489722476 date "2004-12-01" @default.
• W1489722476 modified "2023-10-16" @default.
• W1489722476 title "Phase Space Plots of Streams in the Halo and Their Chemical Tags" @default.
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