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RE-ASSEMBLING THE SAGITTARIUS DWARF GALAXY
Open accessAbstract
What was the mass of the progenitor of the Sagittarius (Sgr) dwarf galaxy? Here, we reassemble the stellar debris using Sloan Digital Sky Survey and Two Micron All-Sky Survey data to find the total luminosity and likely mass. We find that the luminosity is in the range (9.6–13.2) × 10 7 L ☉ or M V ∼ −15.1 to −15.5, with 70% of the light residing in the debris streams. The progenitor is somewhat fainter than the present-day Small Magellanic Cloud, and comparable in brightness to the M31 dwarf spheroidals NGC 147 and NGC 185. Using cosmologically motivated models, we estimate that the mass of Sgr's dark matter halo prior to tidal disruption was ∼10 10 M ☉ .
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Metadata
- Authors
- Niederste-Ostholt, M., Belokurov, V., Evans, N. W., & Peñarrubia, J.
- Affiliations
- University of Cambridge (GB)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2010-03-03
- Volume
- 712
- Issue
- 1
- Pages
- 516-526
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2045041357
- Cited by
- 139
- References
- 46
- Citations by year
- 2026: 1 · 2025: 6 · 2024: 7 · 2023: 6 · 2022: 7 · 2021: 7 · 2020: 14 · 2019: 2 · 2018: 13 · 2017: 10 · 2016: 10 · 2015: 6 · 2014: 14 · 2013: 7 · 2012: 8
- FWCI
- 6.42
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Alfred P. Sloan Foundation
- California Institute of Technology
- Max-Planck-Gesellschaft
- Science and Technology Facilities Council (ST/H00243X/1, PP/E00105X/1, ST/H001913/1)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
- Keywords
- Sagittarius dwarf galaxy, progenitor mass, tidal disruption, halo mass, dwarf spheroidal galaxies, Small Magellanic Cloud, NGC 147, NGC 185, Galactic halo
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