2011

Galaxy Properties from the Ultra-violet to the Far-Infrared: Lambda-CDM models confront observations

Somerville, R. S., Gilmore, R. C., Primack, J. R. et al.

Understand

We combine a semi-analytic model of galaxy formation with simple analytic recipes describing the absorption and re-emission of starlight by dust in the interstellar medium of galaxies.

  • We use the resulting models to predict galaxy counts and luminosity functions from the far-ultraviolet to the sub-mm, from redshift five to the present, and compare with an extensive compilation of observations.
  • We find that in order to reproduce the rest-UV and optical luminosity functions at high redshift, we must assume an evolving normalization in the dust-to-metal ratio, implying that galaxies of a given bolometric luminosity (or metal column density) must be less extinguished than their local counterparts.
  • In our best-fit model, we find remarkably good agreement with observations from rest-frame 1500 Angstroms to 250 microns.

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