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Title: Cosmic reionization on computers. Ultraviolet continuum slopes and dust opacities in high redshift galaxies

Abstract

In this study, we compare the properties of stellar populations of model galaxies from the Cosmic Reionization On Computers (CROC) project with the exiting UV and IR data. Since CROC simulations do not follow cosmic dust directly, we adopt two variants of the dust-follows-metals ansatz to populate model galaxies with dust. Using the dust radiative transfer code Hyperion, we compute synthetic stellar spectra, UV continuum slopes, and IR fluxes for simulated galaxies. We find that the simulation results generally match observational measurements, but, perhaps, not in full detail. The differences seem to indicate that our adopted dust-follows-metals ansatzes are not fully sufficient. While the discrepancies with the exiting data are marginal, the future JWST data will be of much higher precision, rendering highly significant any tentative difference between theory and observations. It is, therefore, likely, that in order to fully utilize the precision of JWST observations, fully dynamical modeling of dust formation, evolution, and destruction may be required.

Authors:
 [1];  [2]
  1. Univ. of Chicago, Chicago, IL (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1244416
Report Number(s):
FERMILAB-PUB-16-018-A; arXiv:1601.00641
Journal ID: ISSN 1538-4357; 1412038
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Volume: 820; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology: theory; intergalactic medium; large-scale structure of universe; methods: numerical

Citation Formats

Khakhaleva-Li, Zimu, and Gnedin, Nickolay Y. Cosmic reionization on computers. Ultraviolet continuum slopes and dust opacities in high redshift galaxies. United States: N. p., 2016. Web. doi:10.3847/0004-637X/820/2/133.
Khakhaleva-Li, Zimu, & Gnedin, Nickolay Y. Cosmic reionization on computers. Ultraviolet continuum slopes and dust opacities in high redshift galaxies. United States. https://doi.org/10.3847/0004-637X/820/2/133
Khakhaleva-Li, Zimu, and Gnedin, Nickolay Y. Wed . "Cosmic reionization on computers. Ultraviolet continuum slopes and dust opacities in high redshift galaxies". United States. https://doi.org/10.3847/0004-637X/820/2/133. https://www.osti.gov/servlets/purl/1244416.
@article{osti_1244416,
title = {Cosmic reionization on computers. Ultraviolet continuum slopes and dust opacities in high redshift galaxies},
author = {Khakhaleva-Li, Zimu and Gnedin, Nickolay Y.},
abstractNote = {In this study, we compare the properties of stellar populations of model galaxies from the Cosmic Reionization On Computers (CROC) project with the exiting UV and IR data. Since CROC simulations do not follow cosmic dust directly, we adopt two variants of the dust-follows-metals ansatz to populate model galaxies with dust. Using the dust radiative transfer code Hyperion, we compute synthetic stellar spectra, UV continuum slopes, and IR fluxes for simulated galaxies. We find that the simulation results generally match observational measurements, but, perhaps, not in full detail. The differences seem to indicate that our adopted dust-follows-metals ansatzes are not fully sufficient. While the discrepancies with the exiting data are marginal, the future JWST data will be of much higher precision, rendering highly significant any tentative difference between theory and observations. It is, therefore, likely, that in order to fully utilize the precision of JWST observations, fully dynamical modeling of dust formation, evolution, and destruction may be required.},
doi = {10.3847/0004-637X/820/2/133},
url = {https://www.osti.gov/biblio/1244416}, journal = {The Astrophysical Journal (Online)},
issn = {1538-4357},
number = 2,
volume = 820,
place = {United States},
year = {2016},
month = {3}
}

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    Works referencing / citing this record:

    Interpreting the evolution of galaxy colours from z  = 8 to 5
    journal, July 2016