Thomas Michael Callingham thomas.m.callingham@durham.ac.uk
PGR Student Doctor of Philosophy
The mass of the Milky Way from satellite dynamics
Callingham, Thomas M; Cautun, Marius; Deason, Alis J; Frenk, Carlos S; Wang, Wenting; Gómez, Facundo A; Grand, Robert JJ; Marinacci, Federico; Pakmor, Ruediger
Authors
Marius Cautun
Professor Alis Deason alis.j.deason@durham.ac.uk
Professor
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
Wenting Wang
Facundo A Gómez
Robert JJ Grand
Federico Marinacci
Ruediger Pakmor
Abstract
We present and apply a method to infer the mass of the Milky Way (MW) by comparing the dynamics of MW satellites to those of model satellites in the EAGLE cosmological hydrodynamics simulations. A distribution function (DF) for galactic satellites is constructed from EAGLE using specific angular momentum and specific energy, which are scaled so as to be independent of host halo mass. In this 2-dimensional space, the orbital properties of satellite galaxies vary according to the host halo mass. The halo mass can be inferred by calculating the likelihood that the observed satellite population is drawn from this DF. Our method is robustly calibrated on mock EAGLE systems. We validate it by applying it to the completely independent suite of 30 AURIGA high-resolution simulations of MW-like galaxies: the method accurately recovers their true mass and associated uncertainties. We then apply it to ten classical satellites of the MW with 6D phasespace measurements, including updated proper motions from the Gaia satellite. The mass of the MW is estimated to be MMW 200 = 1.17+0.21 −0.15 × 1012M (68% confidence limits). We combine our total mass estimate with recent mass estimates in the inner regions of the Galaxy to infer an inner dark matter (DM) mass fraction MDM(< 20 kpc)/MDM 200 = 0.12 which is typical of ∼1012M ΛCDM haloes in hydrodynamical galaxy formation simulations. Assuming an NFW profile, this is equivalent to a halo concentration of c MW 200 = 10.9 +2.6 −2.0.
Citation
Callingham, T. M., Cautun, M., Deason, A. J., Frenk, C. S., Wang, W., Gómez, F. A., …Pakmor, R. (2019). The mass of the Milky Way from satellite dynamics. Monthly Notices of the Royal Astronomical Society, 484(4), 5453-5467. https://doi.org/10.1093/mnras/stz365
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 4, 2019 |
Online Publication Date | Feb 5, 2019 |
Publication Date | Apr 21, 2019 |
Deposit Date | Feb 6, 2019 |
Publicly Available Date | Feb 6, 2019 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 484 |
Issue | 4 |
Pages | 5453-5467 |
DOI | https://doi.org/10.1093/mnras/stz365 |
Public URL | https://durham-repository.worktribe.com/output/1303617 |
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Accepted Journal Article
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Copyright Statement
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
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