Asymmetric Drift of Andromeda Analogs in the IllustrisTNG Simulation

Abstract

We analyze the kinematics as a function of stellar age for Andromeda (M31) mass analogs from the IllustrisTNG cosmological simulation. We divide the star particles into four age groups: less than 1 Gyr, 1 to 5 Gyr, 5 to 10 Gyr, and greater 10 Gyr, and compare the kinematics of these groups to that of the neutral gas cells. We calculate rotation curves for the stellar and gaseous components of each analog from 2 kpc to 20 kpc from the center of mass. We find that the lag, or asymmetric drift (AD), between the gas rotation curve and the stellar rotation curve on average increases with stellar age. This finding is consistent with observational measurements of AD in the disk of the Andromeda galaxy. When the M31 analogs are separated into groups based on merger history, we find that there is a difference in the AD of the analogs that have had a 4:1 merger the last 4 Gyr, 8 Gyr, or 12 Gyr compared to analogs that have not experienced a 4:1 merger in the same time frame. The subset of analogs that have had a 4:1 merger within the last 4 Gyr are also similar to AD measurements of stars in the disk of M31, providing evidence that M31 may in fact have recently merged with a galaxy nearly one fourth of its mass. Further work using high resolution zoom in simulations is required to explore the contribution of internal heating to AD.

arXiv comment14 pages, 11 figures, accepted to MNRAS for publication July 20, 2020

References in corpus (74)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• Planck 2015 results. XIII. Cosmological parameters
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Populating a cluster of galaxies - I. Results at z=0
• E pur si muove: Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• First results from the IllustrisTNG simulations: matter and galaxy clustering
• First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
• First results from the IllustrisTNG simulations: the galaxy color bimodality
• First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium
• First results from the IllustrisTNG simulations: radio haloes and magnetic fields
• Local stellar kinematics from Hipparcos data
• Substructures in hydrodynamical cluster simulations
• Radial Mixing in Galactic Discs
• The merger rate of galaxies in the Illustris Simulation: a comparison with observations and semi-empirical models
• Simulations of Galaxy Formation in a Lambda CDM Universe II: The Fine Structure of Simulated Galactic Disks
• A giant stream of metal-rich stars in the halo of the galaxy M31
• The Geneva-Copenhagen Survey of the Solar neighbourhood III. Improved distances, ages, and kinematics
• The Illustris Simulation: Public Data Release
• The stellar mass assembly of galaxies in the Illustris simulation: growth by mergers and the spatial distribution of accreted stars
• Supermassive black holes and their feedback effects in the IllustrisTNG simulation
• The optical morphologies of galaxies in the IllustrisTNG simulation: a comparison to Pan-STARRS observations
• Quantifying the Fragility of Galactic Disks in Minor Mergers
• The Milky Way's circular velocity curve between 4 and 14 kpc from APOGEE data
• Evidence for Stellar Substructure in the Halo and Outer Disk of M31
• The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action
• The Emergence of the Thick Disk in a CDM Universe
• The Panchromatic Hubble Andromeda Treasury
• Secular Evolution in Disk Galaxies
• Breathing FIRE: How Stellar Feedback Drives Radial Migration, Rapid Size Fluctuations, and Population Gradients in Low-Mass Galaxies
• The large-scale structure of the halo of the Andromeda Galaxy Part I: global stellar density, morphology and metallicity properties
• On the accretion origin of a vast extended stellar disk around the Andromeda galaxy
• The Panchromatic Hubble Andromeda Treasury X. Ultraviolet to Infrared Photometry of 117 Million Equidistant Stars
• The relationship between black hole mass and galaxy properties: Examining the black hole feedback model in IllustrisTNG
• HI kinematics and dynamics of Messier 31
• The long bar as seen by the VVV survey: I. Colour-magnitude diagrams
• Stellar mass map and dark matter distribution in M31
• The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution
• The Luminosity Profile and Structural Parameters of the Andromeda Galaxy
• The large-scale structure of the halo of the Andromeda galaxy II. Hierarchical structure in the Pan-Andromeda Archaeological Survey
• Galactic masers and the Milky Way circular velocity
• A wide-field HI mosaic of Messier 31. II.The disk warp, rotation and the dark matter halo
• A 2-3 billion year old major merger paradigm for the Andromeda galaxy and its outskirts
• Synthetic Galaxy Images and Spectra from the Illustris Simulation
• The Andromeda galaxy's most important merger about 2 billion years ago as M32's likely progenitor
• The Panchromatic Hubble Andromeda Treasury XI: The Spatially-Resolved Recent Star Formation History of M31
• The Planetary Nebula System of M33
• On The Formation of Disk Galaxies and Massive Central Objects
• A Study of Edge-On Galaxies with the Hubble Space Telescope's Advanced Camera for Surveys. II. Vertical distribution of the resolved stellar population
• The vertical motion history of disk stars throughout the Galaxy
• Was the Andromeda Stream Produced by a Disk Galaxy?
• A clear age-velocity dispersion correlation in Andromeda's stellar disk
• Structure and Population of the Andromeda Stellar Halo from a Subaru/Suprime-Cam Survey
• Galaxies grow their bulges and black holes in diverse ways
• Pressure Support in Galaxy Disks: Impact on Rotation Curves and Dark Matter Density Profiles
• Heated Disc Stars in the Stellar Halo
• Planetary Nebulae in Face-On Spiral Galaxies. III. Planetary Nebula Kinematics and Disk Mass
• A New Approach to Detailed Structural Decomposition from the SPLASH and PHAT Surveys: Kicked-up Disk Stars in the Andromeda Galaxy?
• Orbits of massive satellite galaxies: II. Bayesian Estimates of the Milky Way and Andromeda masses using high precision astrometry and cosmological simulations
• The DiskMass Survey. IV. The Dark-Matter-Dominated Galaxy UGC 463
• Elemental Abundances in M31: A Comparative Analysis of Iron and Alpha Element Abundances in the Outer Disk, Giant Stellar Stream, and Inner Halo of M31
• Two major accretion epochs in M31 from two distinct populations of globular clusters
• Why are some galaxies not barred?
• A unified model for age-velocity dispersion relations in Local Group galaxies: Disentangling ISM turbulence and latent dynamical heating
• Substructure and Tidal Streams in the Andromeda Galaxy and its Satellites
• Elemental Abundances in M31: Alpha and Iron Element Abundances from Low-Resolution Resolved Stellar Spectroscopy in the Stellar Halo
• Asymmetric Drift in the Andromeda Galaxy (M31) as a Function of Stellar Age
• Andromeda Optical and Infrared Disk Survey I. New Insights in Wide-Field Near-IR Surface Photometry
• The local rotation curve of the Milky Way based on SEGUE and RAVE data
• The survey of Planetary Nebulae in Andromeda (M31): I. Imaging the disk and halo with MegaCam@CFHT

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• Elemental abundances in M31: Individual and Coadded Spectroscopic [Fe/H] and [α/Fe] throughout the M31 Halo with SPLASH
• Resolved SPLASH Chemodynamics in Andromeda's PHAT Stellar Halo and Disk: On the Nature of the Inner Halo Along the Major Axis
• The SAMI Survey: Evidence for dynamical coupling of ionised gas and young stellar populations