William I. Cowley
The evolution of the UV-to-mm extragalactic background light: evidence for a top-heavy initial mass function?
Cowley, William I.; Lacey, Cedric G.; Baugh, Carlton M.; Cole, Shaun; Frenk, Carlos S.; Lagos, Claudia del P.
Authors
Professor Cedric Lacey cedric.lacey@durham.ac.uk
Professor
Professor Carlton Baugh c.m.baugh@durham.ac.uk
Professor
Professor Shaun Cole shaun.cole@durham.ac.uk
Director of the Institute for Computational Cosmology
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
Claudia del P. Lagos
Abstract
We present predictions for the UV-to-mm extragalactic background light (EBL) from a recent version of the GALFORM semi-analytical model of galaxy formation which invokes a top-heavy stellar initial mass function (IMF) for galaxies undergoing dynamically-triggered bursts of star formation. We combine GALFORM with the GRASIL radiative transfer code for computing fully self-consistent UV-to-mm spectral energy distributions for each simulated galaxy, accounting for the absorption and re-emission of stellar radiation by interstellar dust. The predicted EBL is in near-perfect agreement with recent observations over the whole UV-to-mm spectrum, as is the evolution of the cosmic spectral energy distribution over the redshift range for which observations are available (z ≲ 1). We show that approximately 90 per cent of the EBL is produced at z < 2 although this shifts to higher redshifts for sub-mm wavelengths. We assess whether the top-heavy IMF in starbursts is necessary in order to reproduce the EBL at the same time as other key observables, and find that variant models with a universal solar-neighborhood IMF display poorer agreement with EBL observations over the whole UV-to-mm spectrum and fail to match the counts of galaxies in the sub-mm.
Journal Article Type | Article |
---|---|
Acceptance Date | May 14, 2019 |
Online Publication Date | Jun 13, 2019 |
Publication Date | Aug 31, 2019 |
Deposit Date | Jun 4, 2019 |
Publicly Available Date | Jun 14, 2019 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 487 |
Issue | 3 |
Pages | 3082-3101 |
DOI | https://doi.org/10.1093/mnras/stz1398 |
Public URL | https://durham-repository.worktribe.com/output/1300140 |
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Accepted Journal Article
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Copyright Statement
© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
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