An observational testbed for cosmological zoom-in simulations: constraining stellar migration in the solar cylinder using asteroseismology
TLDR
In this article, the authors developed a framework to compare a variety of parameters with their corresponding predictions from simulations in an unbiased manner, taking into account the selection function of a stellar survey, and applied this framework to a sample of over 7000 stars with asteroseismic, spectroscopic, and astrometric data available, together with 6 simulations from the Auriga project.Abstract:
Large-scale stellar surveys coupled with recent developments in magneto-hydrodynamical simulations of the formation of Milky Way-mass galaxies provide an unparalleled opportunity to unveil the physical processes driving the evolution of the Galaxy. We developed a framework to compare a variety of parameters with their corresponding predictions from simulations in an unbiased manner, taking into account the selection function of a stellar survey. We applied this framework to a sample of over 7000 stars with asteroseismic, spectroscopic, and astrometric data available, together with 6 simulations from the Auriga project. We found that some simulations are able to produce abundance dichotomies in the $[{\rm Fe}/{\rm H}]-[\alpha/{\rm Fe}]$ plane which look qualitatively similar to observations. The peak of their velocity distributions match the observed data reasonably well, however they predict hotter kinematics in terms of the tails of the distributions and the vertical velocity dispersion. Assuming our simulation sample is representative of Milky Way-like galaxies, we put upper limits of 2.21 and 3.70 kpc on radial migration for young ($< 4$ Gyr) and old ($\in [4, 8]$ Gyr) stellar populations in the solar cylinder. Comparison between the observed and simulated metallicity dispersion as a function of age further constrains migration to about 1.97 and 2.91 kpc for the young and old populations. These results demonstrate the power of our technique to compare numerical simulations with high-dimensional datasets, and paves the way for using the wider field TESS asteroseismic data together with the future generations of simulations to constrain the subgrid models for turbulence, star formation and feedback processes.read more
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Journal ArticleDOI
Determining the full satellite population of a Milky Way-mass halo in a highly resolved cosmological hydrodynamic simulation
Robert J. J. Grand,Robert J. J. Grand,Robert J. J. Grand,Federico Marinacci,Rüdiger Pakmor,Christine M. Simpson,Ashley J. Kelly,Facundo A. Gómez,Adrian Jenkins,Volker Springel,Carlos S. Frenk,Simon D. M. White +11 more
TL;DR: In this article, the formation of the satellite galaxy population of a Milky Way-mass halo in a very highly resolved magneto-hydrodynamic cosmological zoom-in simulation was investigated.
Journal ArticleDOI
The impact of two massive early accretion events in a Milky Way-like galaxy: repercussions for the buildup of the stellar disc and halo
Matthew D. A. Orkney,Chervin F. P. Laporte,Robert J. J. Grand,Facundo A. G'omez,F. van de Voort,Federico Marinacci,Francesca Fragkoudi,Rüdiger Pakmor,Volker Springel +8 more
TL;DR: In this paper , the authors identify and characterise a Milky Way-like realisation from the Auriga simulations with two consecutive massive mergers ∼2 Gyr apart at high redshift, comparable to the reported Kraken and Gaia-Sausage-Enceladus.
Journal ArticleDOI
Stellar migration in the Auriga simulations
TL;DR: In this article , the authors studied the presence and importance of stellar migration in the evolution of 17 Milky-Way like disk galaxies with stellar mass 10 < log(M*/M⊙) < 11 from the Auriga suite of zoom-in cosmological hydrodynamical simulations.
Journal ArticleDOI
Disc dichotomy signature in the vertical distribution of [Mg/Fe] and the delayed gas infall scenario
TL;DR: In this article , an analysis of the Apache Point Observatory Galactic Evolution Experiment project (APOGEE) data suggests the existence of a clear distinction between two sequences of disc stars in the [ α / Fe] versus [Fe / H] abundance ratio space, known as the high and low- α sequence, respectively.
Journal ArticleDOI
Determining the full satellite population of a Milky Way-mass halo in a highly resolved cosmological hydrodynamic simulation
Robert J. J. Grand,Robert J. J. Grand,Robert J. J. Grand,Federico Marinacci,Rüdiger Pakmor,Christine M. Simpson,Ashley J. Kelly,Facundo A. Gómez,Adrian Jenkins,Volker Springel,Carlos S. Frenk,Simon D. M. White +11 more
TL;DR: In this paper, the formation of the satellite galaxy population of a Milky Way-mass halo in a very highly resolved magnetohydrodynamic cosmological zoom-in simulation (baryonic mass resolution mb = 800 M⊙ ) is investigated.
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Journal ArticleDOI
Planck 2013 results. XVI. Cosmological parameters
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TL;DR: In this paper, the authors present the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra, which are extremely well described by the standard spatially-flat six-parameter ΛCDM cosmology with a power-law spectrum of adiabatic scalar perturbations.