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Predictions for Herschel from Λ-cold dark matter : unveiling the cosmic star formation history.

Lacey, C.G. and Baugh, C.M. and Frenk, C.S. and Benson, A.J. and Orsi, A. and Silva, L. and Granato, G.L. and Bressan, A. (2010) 'Predictions for Herschel from Λ-cold dark matter : unveiling the cosmic star formation history.', Monthly notices of the Royal Astronomical Society., 405 (1). pp. 2-28.


We use a model for the evolution of galaxies in the far-infrared (far-IR) based on the Λ-cold dark matter cosmology to make detailed predictions for the upcoming cosmological surveys with the Herschel Space Observatory. We use the combined GALFORM semi-analytical galaxy formation model and GRASIL spectrophotometric code to compute galaxy spectral energy distribution (SEDs) including the reprocessing of radiation by dust. The model, which is the same as that in Baugh et al., assumes two different initial mass functions (IMFs): a normal solar neighbourhood IMF for quiescent star formation in discs, and a very top-heavy IMF in starbursts triggered by galaxy mergers. We have shown previously that the top-heavy IMF appears necessary to explain the number counts and redshifts of faint submillimetre galaxies. In this paper, we present predictions for galaxy luminosity functions, number counts and redshift distributions in the Herschel imaging bands. We find that source confusion will be a serious problem in the deepest planned surveys. We also show predictions for physical properties such as star formation rates and stellar, gas and halo masses, together with fluxes at other wavelengths (from the far-ultraviolet to the radio) relevant for multi-wavelength follow-up observations. We investigate what fraction of the total IR emission from dust and of the high-mass star formation over the history of the Universe should be resolved by planned surveys with Herschel, and find a fraction ∼30–50 per cent, depending on confusion. Finally, we show that galaxies in Herschel surveys should be significantly clustered.

Item Type:Article
Keywords:Dust, Extinction, ISM: evolution, Galaxies: evolution, Galaxies: formation, Galaxies: high-redshift, Infrared: galaxies.
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2010 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:19 February 2015
Date of first online publication:June 2010
Date first made open access:No date available

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