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.
Professor Cedric Lacey email@example.com
Professor Carlton Baugh firstname.lastname@example.org
Professor Shaun Cole email@example.com
Director of the Institute for Computational Cosmology
Professor Carlos Frenk firstname.lastname@example.org
Claudia del P. Lagos
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.
Cowley, W. I., Lacey, C. G., Baugh, C. M., Cole, S., Frenk, C. S., & Lagos, C. D. P. (2019). The evolution of the UV-to-mm extragalactic background light: evidence for a top-heavy initial mass function?. Monthly Notices of the Royal Astronomical Society, 487(3), 3082-3101. https://doi.org/10.1093/mnras/stz1398
|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|
|Publisher||Royal Astronomical Society|
|Peer Reviewed||Peer Reviewed|
Accepted Journal Article
© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
Published Journal Article
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