Infrared Properties of z=7 Galaxies from Cosmological Simulations

Abstract

Three-dimensional panchromatic dust radiative transfer calculations are performed on a set of 198 galaxies of stellar masses in the range 5x10^8-3x10^10 Msun from a cosmological hydrodynamic simulation (resolved at 29pc/h) at z=7. In a companion paper (Kimm & Cen), the stellar mass and UV luminosity functions, and UV-optical and FUV-NUV colors are shown to be in good agreement with observations, if an SMC-type dust extinction curve is adopted. Here we make useful predictions, self-consistently, of the infrared properties of these z=7 simulated galaxies that can be confronted with upcoming ALMA data. Our findings are as follows. (1) The effective radius in the rest-frame MIPS 70 micron band is in the range of 80-400pc proper for z=7 galaxies with L_FIR=10^{11.3-12}Lsun. (2) The median of the peak wavelength of the far-infrared (FIR) spectral energy distribution is in the range of 45-60 micron, depending on the dust-to-metal ratio. (3) For star formation rate in the range 3-100 Msun/yr the median FIR to bolometric luminosity ratio is 60-90%. (4) The FIR luminosity function displays a power law in the high end with a slope of -3.1 +- 0.4, instead of the usual exponential decline.

15 pages, 7 figures, ~in press of ApJ

References in corpus (7)

• Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
• Sunrise: Polychromatic Dust Radiative Transfer in Arbitrary Geometries
• Modelling the Pan-Spectral Energy Distribution of Starburst Galaxies: IV The Controlling Parameters of the Starburst SED
• Evolution of the Intergalactic Opacity: Implications for the Ionizing Background, Cosmic Star Formation, and Quasar Activity
• On the Origin of the Hubble Sequence: I. Insights on Galaxy Color Migration from Cosmological Simulations
• Galaxy Size Problem at z=3: Simulated Galaxies Are Too Small
• Studying the first galaxies with ALMA

Cited by in corpus (18)

• The BlueTides Simulation: First Galaxies and Reionization
• The galaxy luminosity function at z ~ 6 and evidence for rapid evolution in the bright end from z ~ 7 to 5
• Simulating galaxies in the reionization era with FIRE-2: galaxy scaling relations, stellar mass functions, and luminosity functions
• Dust attenuation, dust emission, and dust temperature in galaxies at z>=5: a view from the FIRE-2 simulations
• ALMA reveals metals yet no dust within multiple components in CR7
• Resolved UV and [CII] structures of luminous galaxies within the epoch of reionisation
• Spatially adaptive radiation-hydrodynamical simulations of galaxy formation during cosmological reionization
• The spectral evolution of the first Galaxies. III. Simulated James Webb Space Telescope spectra of reionization-epoch galaxies with Lyman continuum leakage
• Powderday: Dust Radiative Transfer for Galaxy Simulations
• The formation of Milky Way-mass disk galaxies in the first 500 million years of a cold dark matter universe
• First Light: exploring the Spectra of High-Redshift Galaxies in the Renaissance Simulations
• High redshift JWST predictions from IllustrisTNG: III. Infrared luminosity functions, obscured star formation and dust temperature of high-redshift galaxies
• Observational Properties of Simulated Galaxies in Overdense and Average Regions at High Redshifts z= 6-12
• First Light II: Emission Line Extinction, Population III Stars, and X-ray Binaries
• Contribution of the first galaxies to the cosmic far-infrared/sub-millimeter background - I. Mean background level
• Diverse Properties of Interstellar Medium Embedding Gamma-Ray Bursts at the Epoch of Reionization
• Galaxy Zoo JWST: Up to 75% of discs are featureless at $3<z<7$
• Redshift Horizon for Detecting the First Galaxies in Far-Infared Surveys