The DOI matches its Crossref record; 34 of the 34 references it cites were found in a registry or an index.
Building up the stellar halo of the Galaxy
Open accessAbstract
We study numerical simulations of satellite galaxy disruption in a potential resembling that of the Milky Way. Our goal is to assess whether a merger origin for the stellar halo would leave observable fossil structure in the phase-space distribution of nearby stars. We show how mixing of disrupted satellites can be quantified using a coarse-grained entropy. Although after 10 Gyr few obvious asymmetries remain in the distribution of particles in configuration space, strong correlations are still present in velocity space. We give a simple analytic description of these effects, based on a linearized treatment in action-angle variables, which shows how the kinematic and density structure of the debris stream changes with time. By applying this description we find that a single dwarf elliptical-like satellite of current luminosity 108 L⊙ disrupted 10 Gyr ago from an orbit circulating in the inner halo (mean apocentre ∼12 kpc) would contribute about ∼30 kinematically cold streams with internal velocity dispersions below 5 km s−1 to the local stellar halo. If the whole stellar halo were built by such disrupted satellites, it should consist locally of 300–500 such streams. Clear detection of all these structures would require a sample of a few thousand stars with 3D velocities accurate to better than 5 km s−1. Even with velocity errors several times worse than this, the expected clumpiness should be quite evident. We apply our formalism to a group of stars detected near the North Galactic Pole, and derive an order-of-magnitude estimate for the initial properties of the progenitor system.
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Cites
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Self-citationThe formation and evolution of galaxies within merging dark matter haloes*
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Cited by
The New Galaxy: Signatures of Its Formation
Freeman, K., & Bland-Hawthorn, J. (2002) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.40.060401.093840 · Cited by 1,160
Multiple populations in globular clusters: Lessons learned from the Milky Way globular clusters
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Debris streams in the solar neighbourhood as relicts from the formation of the Milky Way
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Self-citationGalactic stellar haloes in the CDM model
Cooper, A. P., Cole, S., Frenk, C. S., White, S. D. M., Helly, J., Benson, A. J., De Lucia, G., Helmi, A., Jenkins, A., Navarro, J. F., et al. (2010) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2010.16740.x · Cited by 594
Self-citationLAMOST Experiment for Galactic Understanding and Exploration (LEGUE) — The survey's science plan
Deng, L.-C., Newberg, H. J., Liu, C., Carlin, J. L., Beers, T. C., Chen, L., Chen, Y.-Q., Christlieb, N., Grillmair, C. J., Guhathakurta, P., et al. (2012) · Research in Astronomy and Astrophysics · doi:10.1088/1674-4527/12/7/003 · Cited by 554
Metadata
- Authors
- Helmi, A., & White, S. D. M.
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 1999-08-11
- Volume
- 307
- Issue
- 3
- Pages
- 495-517
- ISSN
- 0035-8711 (ISSN-L)
- 1365-2966
- OpenAlex
- W2069495789
- Cited by
- 462
- References
- 34
- FWCI
- 12.41
- Type
- journal article
- Language
- en
- Open access
- green
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