Cited by 65Galaxies: Formation, Evolution, PhenomenaStellar, planetary, and galactic studiesCosmology and Gravitation Theories

The orbital ellipticity of satellite galaxies and the mass of the Milky Way

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Barber, Christopher, Starkenburg, Else, Navarro, Julio F., McConnachie, Alan W., Fattahi, Azadeh·2014·Monthly Notices of the Royal Astronomical Society

Abstract

We use simulations of Milky Way-sized dark matter haloes from the Aquarius Project to investigate the orbits of substructure haloes likely, according to a semi-analytic galaxy formation model, to host luminous satellites. These tend to populate the most massive subhaloes and are on more radial orbits than the majority of subhaloes found within the halo virial radius. One reason for this (mild) kinematic bias is that many low-mass subhaloes have apocentres that exceed the virial radius of the host; they are thus excluded from subhalo samples identified within the virial boundary, reducing the number of subhaloes on radial orbits. Two other factors contributing to the difference in orbital shape between dark and luminous subhaloes are their dynamical evolution after infall, which affects more markedly low-mass (dark) subhaloes, and a weak dependence of ellipticity on the redshift of first infall. The ellipticity distribution of luminous satellites exhibits little halo-to-halo scatter, and it may therefore be compared fruitfully with that of Milky Way satellites. Since the latter depends sensitively on the total mass of the Milky Way we can use the predicted distribution of satellite ellipticities to place constraints on this important parameter. Using the latest estimates of position and velocity of dwarfs compiled from the literature, we find that the most likely Milky Way mass lies in the range 6 × 1011 M⊙ < M200 < 3.1 × 1012 M⊙, with a best-fitting value of M200 = 1.1 × 1012 M⊙. This value is consistent with Milky Way mass estimates based on dynamical tracers or the timing argument.

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Research works printed but not linked: 2

  1. Planck Collaboration et al., 2013, preprint (arXiv:e-prints)
  2. Rigaut F. et al., 2012, in Ellerbroek B. L., Marchetti E., Véran J.-P., eds, Proc. SPIE Conf. Ser., Vol. 8447, Adaptive Optics Systems III. SPIE, Bellingham, 84470I Sales L. V., Navarro J. F., Abadi M. G., Steinmetz M., 2007a, MNRAS, 379, 1464

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Authors
Barber, C., Starkenburg, E., Navarro, J. F., McConnachie, A. W., & Fattahi, A.
Affiliations
  • University of Victoria (CA)
  • Canadian Institute for Advanced Research (CA)
  • Herzberg Institute of Astrophysics (CA)
Venue
Monthly Notices of the Royal Astronomical Society
Published
2013-11-11
Volume
437
Issue
1
Pages
959-967
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2137505185
Cited by
65
References
116
Citations by year
2025: 2 · 2024: 4 · 2023: 5 · 2021: 4 · 2020: 8 · 2019: 6 · 2018: 8 · 2017: 10 · 2016: 6 · 2015: 4 · 2014: 8
FWCI
3.23
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • NPARC (submittedVersion)
  • arXiv (Cornell University)
Funders
  • Canadian Institute for Advanced Research
  • Canadian Institute for Theoretical Astrophysics
  • Virgo Consortium
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 › Cosmology and Gravitation Theories
Keywords
Milky Way mass, dark matter subhalos, radial orbits, Aquarius Project, Milky Way satellites, dwarf spheroidal galaxies

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