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The cosmic spectral energy distribution in the EAGLE simulation
- Source :
- Monthly Notices of the RAS (0035-8711), 484(3), 4069-4082, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Monthly notices of the Royal Astronomical Society, 2019, Vol.484(3), pp.4069-4082 [Peer Reviewed Journal]
- Publication Year :
- 2019
- Publisher :
- Oxford University Press (OUP), 2019.
-
Abstract
- The cosmic spectral energy distribution (CSED) is the total emissivity as a function of wavelength of galaxies in a given cosmic volume. We compare the observed CSED from the UV to the submm to that computed from the EAGLE cosmological hydrodynamical simulation, post-processed with stellar population synthesis models and including dust radiative transfer using the SKIRT code. The agreement with the data is better than 0.15 dex over the entire wavelength range at redshift $z=0$, except at UV wavelengths where the EAGLE model overestimates the observed CSED by up to a factor 2. Global properties of the CSED as inferred from CIGALE fits, such as the stellar mass density, mean star formation density, and mean dust-to-stellar-mass ratio, agree to within better than 20 per cent. At higher redshift, EAGLE increasingly underestimates the CSED at optical-NIR wavelengths with the FIR/submm emissivity underestimated by more than a factor of 5 by redshift $z=1$. We believe that these differences are due to a combination of incompleteness of the EAGLE-SKIRT database, the small simulation volume and the consequent lack of luminous galaxies, and our lack of knowledge on the evolution of the characteristics of the interstellar dust in galaxies. The impressive agreement between the simulated and observed CSED at lower $z$ confirms that the combination of EAGLE and SKIRT dust processing yields a fairly realistic representation of the local Universe.<br />14 pages, 5 figures, accepted for publication in MNRAS
- Subjects :
- Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Stellar population
Stellar mass
DISC GALAXIES
MU-M
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
01 natural sciences
RADIATIVE-TRANSFER CODE
0103 physical sciences
Radiative transfer
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
evolution [galaxies]
Astrophysics::Galaxy Astrophysics
Cosmic dust
Physics
010308 nuclear & particles physics
Star formation
GALAXY LUMINOSITY FUNCTION
HERSCHEL-ATLAS
Astronomy and Astrophysics
DUST CONTENT
STAR-FORMATION HISTORY
Astrophysics - Astrophysics of Galaxies
observations [cosmology]
Galaxy
Redshift
EXTRAGALACTIC BACKGROUND LIGHT
Physics and Astronomy
radiative transfer
STELLAR POPULATION SYNTHESIS
13. Climate action
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
hydrodynamics
MASS ASSEMBLY GAMA
Spectral energy distribution
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- ISSN :
- 13652966 and 00358711
- Volume :
- 484
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....b2a8acd51d08f4c36fa75ef2963aff6a