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Cited by 256Stellar, planetary, and galactic studiesGalaxies: Formation, Evolution, PhenomenaAstrophysical Phenomena and Observations

ASSESSING THE MILKY WAY SATELLITES ASSOCIATED WITH THE SAGITTARIUS DWARF SPHEROIDAL GALAXY

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Law, David R., Majewski, Steven R.·2010·The Astrophysical Journal
DOI 10.1088/0004-637x/718/2/1128
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Abstract

Numerical models of the tidal disruption of the Sagittarius (Sgr) dwarf galaxy have recently been developed that for the first time simultaneously satisfy most observational constraints on the angular position, distance, and radial velocity trends of both leading and trailing tidal streams emanating from the dwarf. We use these dynamical models in combination with extant three-dimensional position and velocity data for Galactic globular clusters and dSph galaxies to identify those Milky Way satellites that are likely to have originally formed in the gravitational potential well of the Sgr dwarf, and have been stripped from Sgr during its extended interaction with the Milky Way. We conclude that the globular clusters Arp 2, M 54, NGC 5634, Terzan 8, and Whiting 1 are almost certainly associated with the Sgr dwarf, and that Berkeley 29, NGC 5053, Pal 12, and Terzan 7 are likely to be as well (albeit at lower confidence). The initial Sgr system therefore may have contained five to nine globular clusters, corresponding to a specific frequency S N = 5–9 for an initial Sgr luminosity M V = −15.0. Our result is consistent with the 8 ± 2 genuine Sgr globular clusters expected on the basis of statistical modeling of the Galactic globular cluster distribution and the corresponding false-association rate due to chance alignments with the Sgr streams. The globular clusters identified as most likely to be associated with Sgr are consistent with previous reconstructions of the Sgr age–metallicity relation, and show no evidence for a second-parameter effect shaping their horizontal branch morphologies. We find no statistically significant evidence to suggest that any of the recently discovered population of ultrafaint dwarf galaxies are associated with the Sgr tidal streams, but are unable to rule out this possibility conclusively for all systems.

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Crossref · 10.1088/0004-637x/718/2/1128

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  • Simulations of Law & Majewski (2010) and Niederste-Ostholt et al. (2012) suggest Sagittarius has been undergoing intense tidal disruption for the past 4-7 Gyr.

    “the simulations of Law & Majewski (2010) and Niederste-Ostholt et al. (2012) suggest that it has been undergoing intense tidal disruption for the past 4 7 Gyr.”

    From Kraken reveals itself – the merger history of the Milky Way reconstructed with the E-MOSAICS simulations (2020) · cites this paper as Law & Majewski (2010)

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Authors
Law, D. R., & Majewski, S. R.
Affiliations
  • University of California, Los Angeles (US)
  • University of Virginia (US)
ORCID
Law, David R.
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2010-07-13
Volume
718
Issue
2
Pages
1128-1150
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1088/0004-637x/718/2/1128
OpenAlex
W2079032472
Cited by
256
References
97
Citations by year
2026: 3 · 2025: 8 · 2024: 7 · 2023: 11 · 2022: 14 · 2021: 12 · 2020: 23 · 2019: 17 · 2018: 26 · 2017: 26 · 2016: 19 · 2015: 18 · 2014: 19 · 2013: 16 · 2012: 14
FWCI
9.47
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Keywords
Sagittarius dwarf galaxy, Milky Way satellites, tidal currents, globular clusters, tidal disruption, ultra-faint dwarf galaxies, specific frequency, age-metallicity relation, horizontal branch morphology

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