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A unified multiwavelength model of galaxy formation

Authors
Cedric G. Lacey,Carlton M. Baugh
Carlos S. Frenk,Andrew J. Benson,Richard G. Bower,Shaun Cole,Violeta Gonzalez-Perez,John C. Helly,Claudia D. P. Lagos,Peter D. Mitchell,C. Lacey,C. Baugh,Carlos Frenk,Andrew Benson,R. Bower,Violeta González-Pérez,John Helly,Claudia Lagos
+16 authors
,Peter Mitchell
Published
Aug 1, 2016
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Abstract

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 supressing gas cooling in massive halos, and a new empirical star formation law in galaxy disks 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 mu. This was not previously achieved by a single physical model within the LambdaCDM 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 z=6, and is found to be generally successful. These observations include the optical and near-IR luminosity functions, HI 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. [abridged]

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