%0 Journal Article %T A unified multiwavelength model of galaxy formation %+ Centre de Recherche Astrophysique de Lyon (CRAL) %A Lacey, Cedric G. %A Baugh, Carlton M. %A Frenk, Carlos S. %A Benson, Andrew J. %A Bower, Richard G. %A Cole, Shaun %A Gonzalez-Perez, Violeta %A Helly, John C. %A Lagos, Claudia D. P. %A Mitchell, Peter D. %< avec comité de lecture %@ 0035-8711 %J Monthly Notices of the Royal Astronomical Society %I Oxford University Press (OUP): Policy P - Oxford Open Option A %V 462 %P 3854-3911 %8 2016 %D 2016 %Z 1509.08473 %Z 2016MNRAS.462.3854L %R 10.1093/mnras/stw1888 %K galaxies: evolution %K galaxies: formation %K galaxies: high-redshift %K Astrophysics - Astrophysics of Galaxies %Z Sciences of the Universe [physics] %Z Sciences of the Universe [physics]/Astrophysics [astro-ph]Journal articles %X We present a new version of the GALFORM semi-analytical model of galaxy formation. This brings together several previous developments of GALFORM into a single unified model, including a different initial mass function (IMF) in quiescent star formation and in starbursts, feedback from active galactic nuclei suppressing gas cooling in massive haloes, and a new empirical star formation law in galaxy discs based on their molecular gas content. In addition, we have updated the cosmology, introduced a more accurate treatment of dynamical friction acting on satellite galaxies, and updated the stellar population model. The new model is able to simultaneously explain both the observed evolution of the K-band luminosity function and stellar mass function, and the number counts and redshift distribution of sub-mm galaxies selected at 850 μm. This was not previously achieved by a single physical model within the Λcold dark matter framework, but requires having an IMF in starbursts that is somewhat top-heavy. The new model is tested against a wide variety of observational data covering wavelengths from the far-UV to sub-mm, and redshifts from z = 0 to 6, and is found to be generally successful. These observations include the optical and near-infrared (IR) luminosity functions, H I mass function, fraction of early type galaxies, Tully-Fisher, metallicity-luminosity and size-luminosity relations at z = 0, as well as far-IR number counts, and far-UV luminosity functions at z ∼ 3-6. Discrepancies are, however, found in galaxy sizes and metallicities at low luminosities, and in the abundance of low-mass galaxies at high-z, suggesting the need for a more sophisticated model of supernova feedback. %G English %2 https://insu.hal.science/insu-03710563/document %2 https://insu.hal.science/insu-03710563/file/stw1888.pdf %L insu-03710563 %U https://insu.hal.science/insu-03710563 %~ ENS-LYON %~ INSU %~ CNRS %~ UNIV-LYON1 %~ CRAL %~ UDL %~ UNIV-LYON