The evolution of the UV-to-mm extragalactic background light: evidence for a top-heavy initial mass function?

William I. Cowley, Cedric G. Lacey, Carlton M. Baugh, Shaun Cole, Carlos S. Frenk, Claudia del P. Lagos

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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 TJV-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 less than or similar to 1). We show that approximately 90 per cent of the EDI, 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 EDI, at the same time as other key observables, and find that variant models with a universal solar-neighbourhood IMF display poorer agreement with EDI. observations over the whole UV-to-mm spectrum and fail to match the counts of galaxies in the sub-mm.

Original languageEnglish
Pages (from-to)3082-3101
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume487
Issue number3
DOIs
Publication statusPublished - Aug 2019

Cite this

Cowley, William I. ; Lacey, Cedric G. ; Baugh, Carlton M. ; Cole, Shaun ; Frenk, Carlos S. ; Lagos, Claudia del P. / The evolution of the UV-to-mm extragalactic background light : evidence for a top-heavy initial mass function?. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 487, No. 3. pp. 3082-3101.
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title = "The evolution of the UV-to-mm extragalactic background light: evidence for a top-heavy initial mass function?",
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 TJV-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 less than or similar to 1). We show that approximately 90 per cent of the EDI, 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 EDI, at the same time as other key observables, and find that variant models with a universal solar-neighbourhood IMF display poorer agreement with EDI. observations over the whole UV-to-mm spectrum and fail to match the counts of galaxies in the sub-mm.",
keywords = "galaxies: evolution, galaxies: formation, infrared: galaxies, submillimetre: galaxies, ultraviolet: galaxies, SPECTRAL ENERGY-DISTRIBUTION, COSMIC STAR-FORMATION, GALAXY FORMATION, SUBMILLIMETER GALAXIES, NUMBER COUNTS, POPULATION SYNTHESIS, EAGLE SIMULATIONS, DUST EMISSION, ASSEMBLY GAMA, MILKY-WAY",
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year = "2019",
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doi = "10.1093/mnras/stz1398",
language = "English",
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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.

In: Monthly Notices of the Royal Astronomical Society, Vol. 487, No. 3, 08.2019, p. 3082-3101.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The evolution of the UV-to-mm extragalactic background light

T2 - evidence for a top-heavy initial mass function?

AU - Cowley, William I.

AU - Lacey, Cedric G.

AU - Baugh, Carlton M.

AU - Cole, Shaun

AU - Frenk, Carlos S.

AU - Lagos, Claudia del P.

PY - 2019/8

Y1 - 2019/8

N2 - 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 TJV-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 less than or similar to 1). We show that approximately 90 per cent of the EDI, 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 EDI, at the same time as other key observables, and find that variant models with a universal solar-neighbourhood IMF display poorer agreement with EDI. observations over the whole UV-to-mm spectrum and fail to match the counts of galaxies in the sub-mm.

AB - 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 TJV-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 less than or similar to 1). We show that approximately 90 per cent of the EDI, 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 EDI, at the same time as other key observables, and find that variant models with a universal solar-neighbourhood IMF display poorer agreement with EDI. observations over the whole UV-to-mm spectrum and fail to match the counts of galaxies in the sub-mm.

KW - galaxies: evolution

KW - galaxies: formation

KW - infrared: galaxies

KW - submillimetre: galaxies

KW - ultraviolet: galaxies

KW - SPECTRAL ENERGY-DISTRIBUTION

KW - COSMIC STAR-FORMATION

KW - GALAXY FORMATION

KW - SUBMILLIMETER GALAXIES

KW - NUMBER COUNTS

KW - POPULATION SYNTHESIS

KW - EAGLE SIMULATIONS

KW - DUST EMISSION

KW - ASSEMBLY GAMA

KW - MILKY-WAY

U2 - 10.1093/mnras/stz1398

DO - 10.1093/mnras/stz1398

M3 - Article

VL - 487

SP - 3082

EP - 3101

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -