Observing EAGLE galaxies with JWST: predictions for Milky Way progenitors and their building blocks

Abstract

We present predictions, derived from the EAGLE LCDM cosmological hydrodynamical simulations, for the abundance and properties of galaxies expected to be detected at high redshift by the James Webb Space Telescope (JWST). We consider the galaxy population as a whole and focus on the sub-population of progenitors of Milky Way (MW) analogues, defined to be galaxies with accretion histories similar to the MW's, that is, galaxies that underwent a merger resembling the Gaia-Enceladus-Sausage (GES) event and that contain an analogue of the Large Magellanic Cloud (LMC) satellite today. We derive the luminosity function of all EAGLE galaxies in JWST NIRCam passbands, in the redshift range z=2-8, taking into account dust obscuration and different exposure times. For an exposure time of $T=10^5$s, average MW progenitors are observable as far back as z~6 in most bands, and this changes to z~5 and z~4 for the GES and LMC progenitors, respectively. The progenitors of GES and LMC analogues are, on average, ~2 and ~1 mag fainter than the MW progenitors at most redshifts. They lie, on average, within ~60 and ~30 arcsec, respectively, of their future MW host at all times, and thus will appear within the field-of-view of JWST NIRCam. We conclude that galaxies resembling the main progenitor of the MW and its major accreted components should be observable with JWST beyond redshift 2, providing a new and unique window in studying the formation history of our own galaxy.

arXiv comment17 page, 16 figures. Published in MNRAS

References in corpus (70)

• The chemical composition of the Sun
• Galactic Stellar and Substellar Initial Mass Function
• Gaia Data Release 2. Summary of the contents and survey properties
• The cosmological simulation code GADGET-2
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• Modules for Experiments in Stellar Astrophysics (MESA)
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
• Planck 2013 results. I. Overview of products and scientific results
• A Simple Model for the Absorption of Starlight by Dust in Galaxies
• MILES: A Medium resolution INT Library of Empirical Spectra
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• UV Luminosity Functions at redshifts z~4 to z~10: 10000 Galaxies from HST Legacy Fields
• The merger that led to the formation of the Milky Way's inner stellar halo and thick disk
• The propagation of uncertainties in stellar population synthesis modeling III: model calibration, comparison, and evaluation
• Co-formation of the Galactic disc and the stellar halo
• Analysis of galaxy SEDs from far-UV to far-IR with CIGALE: Studying a SINGS test sample
• The Evolution of the Galaxy Rest-Frame Ultraviolet Luminosity Function Over the First Two Billion Years
• The APOSTLE simulations: solutions to the Local Group's cosmic puzzles
• Galaxy Stellar Mass Functions from ZFOURGE/CANDELS: An Excess of Low-Mass Galaxies Since z=2 and the Rapid Buildup of Quiescent Galaxies
• New Determinations of the UV Luminosity Functions from z~9 to z~2 show a remarkable consistency with halo growth and a constant star formation efficiency
• The Effects of Photoionization on Galaxy Formation - II: Satellites in the Local Group
• The Dust Attenuation Law in Distant Galaxies: Evidence for Variation with Spectral Type
• The Dearth of z~10 Galaxies in all HST Legacy Fields -- The Rapid Evolution of the Galaxy Population in the First 500 Myr
• Baryon effects on the internal structure of LCDM halos in the EAGLE simulations
• Evidence from the H3 Survey that the Stellar Halo is Entirely Comprised of Substructure
• The total mass of the Large Magellanic Cloud from its perturbation on the Orphan stream
• The Evolution of the Galaxy Stellar Mass Function at z= 4-8: A Steepening Low-mass-end Slope with Increasing Redshift
• The Most Luminous z~9-10 Galaxy Candidates yet Found: The Luminosity Function, Cosmic Star-Formation Rate, and the First Mass Density Estimate at 500 Myr
• Efficient 3D NLTE dust radiative transfer with SKIRT
• SKIRT: an Advanced Dust Radiative Transfer Code with a User-Friendly Architecture
• The origin of accreted stellar halo populations in the Milky Way using APOGEE, $\text{Gaia}$, and the EAGLE simulations
• Probing the Dawn of Galaxies at z~9-12: New Constraints from HUDF12/XDF and CANDELS Data
• A redshift-independent efficiency model: star formation and stellar masses in dark matter halos at z>4
• Colours and luminosities of z=0.1 simulated galaxies in the EAGLE simulations
• Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy
• A timing constraint on the (total) mass of the Large Magellanic Cloud
• Contributions to the accreted stellar halo: an atlas of stellar deposition
• Semi-analytic forecasts for JWST - I. UV luminosity functions at z = 4 - 10
• The JWST Extragalactic Mock Catalog: Modeling galaxy populations from the UV through the near-IR over thirteen billion years of cosmic history
• Reconstructing the Last Major Merger of the Milky Way with the H3 Survey
• Reverse engineering the Milky Way
• The mass of the Milky Way from satellite dynamics
• High redshift JWST predictions from IllustrisTNG: Dust modelling and galaxy luminosity functions
• The Bright End of the z~9 and z~10 UV Luminosity Functions using all five CANDELS Fields
• The origin of galactic metal-rich stellar halo components with highly eccentric orbits
• How Common are the Magellanic Clouds?
• Orbits of Massive Satellite Galaxies: I. A Close Look at the Large Magellanic Cloud and a New Orbital History for M33
• Infall Times for Milky Way Satellites From Their Present-Day Kinematics
• The Mass Distribution and Assembly of the Milky Way from the Properties of the Magellanic Clouds
• Dynamics of the Magellanic Clouds in a LCDM Universe
• The relationship between the morphology and kinematics of galaxies and its dependence on dark matter halo structure in EAGLE
• The Formation Times and Building Blocks of Milky Way-mass Galaxies in the FIRE Simulations
• The Local Group as a time machine: studying the high-redshift Universe with nearby galaxies
• Predictions for deep galaxy surveys with JWST from $\Lambda$CDM
• Bright galaxies at Hubble's redshift detection frontier: Preliminary results and design from the redshift z~9-10 BoRG pure-parallel HST survey
• Hierarchical octree and k-d tree grids for 3D radiative transfer simulations
• Using 3D Voronoi grids in radiative transfer simulations
• Orbits of massive satellite galaxies: II. Bayesian Estimates of the Milky Way and Andromeda masses using high precision astrometry and cosmological simulations
• HST imaging of the brightest z~8-9 galaxies from UltraVISTA: the extreme bright end of the UV luminosity function
• How Unusual is the Milky Way's Assembly History?
• The Local Group: The Ultimate Deep Field
• Cosmological insights into the assembly of the radial and compact stellar halo of the Milky Way
• The Early Merger that Made the Galaxy's Stellar Halo
• Detectability of Local Group Dwarf Galaxy Analogues at High Redshifts

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• Galactic Archaeology with Gaia
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• From order to chaos: the blurred out metallicity gradient of the Gaia-Enceladus/Sausage progenitor
• The progenitor galaxies of stellar haloes as "failed" Milky Ways