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A unified multi-wavelength model of galaxy formation

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  • 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
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]
Original languageEnglish
Pages (from-to)3854-3911
Number of pages58
JournalMonthly Notices of the Royal Astronomical Society
Volume462
Issue number4
Early online date1 Aug 2016
DOIs
Publication statusPublished - 11 Jan 2017

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  • A unified multiwavelength model of galaxy formation

    Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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