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Two Distinct Ancient Components in the Sculptor Dwarf Spheroidal Galaxy: First Results from the Dwarf Abundances and Radial Velocities Team
Open accessAbstract
We have found evidence for the presence of two distinct ancient stellar components (both ≥10 Gyr old) in the Sculptor dwarf spheroidal galaxy. We used the ESO Wide Field Imager in conjunction with the Very Large Telescope/FLAMES spectrograph to study the properties of the resolved stellar population of Sculptor out to and beyond the tidal radius. We find that two components are discernible in the spatial distribution of horizontal branch stars in our imaging and in the [Fe/H] and v hel distributions for our large sample of spectroscopic measurements. They can be generally described as a "metal-poor" component ([Fe/H] < -1.7) and a "metal-rich" component ([Fe/H] > -1.7). The metal-poor stars are more spatially extended than the metal-rich stars, and they also appear to be kinematically distinct. These results provide insight into the formation processes of small systems in the early universe and the conditions found there. Even this simplest of galaxies appears to have had a surprisingly complex early evolution.
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Cited by
Star-Formation Histories, Abundances, and Kinematics of Dwarf Galaxies in the Local Group
Tolstoy, E., Hill, V., & Tosi, M. (2009) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-082708-101650 · Cited by 1,179
Self-citationDark matter self-interactions and small scale structure
Tulin, S., & Yu, H.-B. (2018) · Physics Reports · doi:10.1016/j.physrep.2017.11.004 · Cited by 1,111
THE SAGITTARIUS DWARF GALAXY: A MODEL FOR EVOLUTION IN A TRIAXIAL MILKY WAY HALO
Law, D. R., & Majewski, S. R. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/714/1/229 · Cited by 550
The Tidal Evolution of Local Group Dwarf Spheroidals
Penarrubia, J., Navarro, J. F., & McConnachie, A. W. (2008) · The Astrophysical Journal · doi:10.1086/523686 · Cited by 406
The Kinematic Status and Mass Content of the Sculptor Dwarf Spheroidal Galaxy
Battaglia, G., Helmi, A., Tolstoy, E., Irwin, M., Hill, V., & Jablonka, P. (2008) · The Astrophysical Journal · doi:10.1086/590179 · Cited by 334
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Metadata
- Authors
- Tolstoy, E., Irwin, M. J., Helmi, A., Battaglia, G., Jablonka, P., Hill, V., Venn, K. A., Shetrone, M. D., Letarte, B., Cole, A. A., Primas, F., Francois, P., Arimoto, N., Sadakane, K., Kaufer, A., Szeifert, T., & Abel, T.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2004-11-22
- Volume
- 617
- Issue
- 2
- Pages
- L119-L122
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2098720855
- Cited by
- 372
- References
- 0
- FWCI
- 15.56
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Tolstoy, E., Irwin, M. J., Helmi, A., Battaglia, G., Jablonka, P., Hill, V., Venn, K. A., Shetrone, M. D., Letarte, B., Cole, A. A., Primas, F., Francois, P., Arimoto, N., Sadakane, K., Kaufer, A., Szeifert, T., & Abel, T. (2004). Two Distinct Ancient Components in the Sculptor Dwarf Spheroidal Galaxy: First Results from the Dwarf Abundances and Radial Velocities Team. The Astrophysical Journal. https://doi.org/10.1086/427388
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