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The Disruption of the Sagittarius Dwarf Galaxy
Open accessAbstract
Numerical simulations of dwarf spheroidal galaxies undergoing several close encounters with the Milky Way are described. By comparing our models to observed properties of the recently discovered dwarf galaxy in Sagittarius (Sgr), we discuss implications of our results for the formation and evolution of the Milky Way system. We find that existing observations are not sufficient to allow us to place precise limits on either the orbit or the initial state of the dwarf. Debris from the ongoing tidal stripping of the Sagittarius galaxy are expected to form moving groups in the halo of the Galaxy, and the discovery of such stars would strongly constrain the history and dynamical state of the dwarf Furthermore, if Sgr is presently being disrupted, we predict that its remains will be detectable as a moving group in the halo for more than 1 Gyr. Thus, if similar accretion events have occurred in the recent history of the Galaxy, their after effects may still be observable.
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Citations
Cited by
Where Are the Missing Galactic Satellites?
Klypin, A., Kravtsov, A. V., Valenzuela, O., & Prada, F. (1999) · The Astrophysical Journal · doi:10.1086/307643 · Cited by 2,741
DWARF GALAXIES OF THE LOCAL GROUP
Mateo, M. (1998) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.36.1.435 · Cited by 2,362
Tracing Galaxy Formation with Stellar Halos. I. Methods
Bullock, J. S., & Johnston, K. V. (2005) · The Astrophysical Journal · doi:10.1086/497422 · Cited by 1,044
Self-citationThe Ghost of Sagittarius and Lumps in the Halo of the Milky Way
Newberg, H. J., Yanny, B., Rockosi, C., Grebel, E. K., Rix, H., Brinkmann, J., Csabai, I., Hennessy, G., Hindsley, R. B., Ibata, R., et al. (2002) · The Astrophysical Journal · doi:10.1086/338983 · Cited by 760
A giant stream of metal-rich stars in the halo of the galaxy M31
Ibata, R., Irwin, M., Lewis, G., Ferguson, A. M. N., & Tanvir, N. (2001) · Nature · doi:10.1038/35083506 · Cited by 593
Metadata
- Authors
- Johnston, K. V., Spergel, D. N., & Hernquist, L.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1995-10
- Volume
- 451
- Pages
- 598
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2078491204
- Cited by
- 271
- References
- 0
- FWCI
- 10.20
- Type
- journal article
- Language
- en
- Open access
- green
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- Johnston, K. V., Spergel, D. N., & Hernquist, L. (1995). The Disruption of the Sagittarius Dwarf Galaxy. The Astrophysical Journal. https://doi.org/10.1086/176247
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