4.7 Article

Modelling the connection between ultraviolet and infrared galaxy populations across cosmic times

期刊

出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu896

关键词

galaxies: evolution; galaxies: luminosity function, mass function; galaxies: statistics; infrared: galaxies; ultraviolet: galaxies

资金

  1. ERC-StG UPGAL [240039]
  2. [ANR-08-JCJC-0008]
  3. European Research Council (ERC) [240039] Funding Source: European Research Council (ERC)

向作者/读者索取更多资源

Using a phenomenological approach, we self-consistently model the redshift evolution of the ultraviolet (UV) and infrared (IR) luminosity functions across cosmic time, as well as a range of observed IR properties of UV-selected galaxy population. This model is an extension of the 2SFM (2 star formation modes) formalism, which is based on the observed 'main sequence' of star-forming galaxies, i.e. a strong correlation between their stellar mass and their star formation rate, and a secondary population of starbursts with an excess of star formation. The balance between the UV light from young, massive stars and the dust-reprocessed IR emission is modelled following the empirical relation between the attenuation (IRX for IR excess hereafter) and the stellar mass, assuming a scatter of 0.4 dex around this relation. We obtain good overall agreement with the measurements of the IR luminosity function up to z similar to 3 and the UV luminosity functions up to z similar to 6, and show that a scatter on the IRX-M relation is mandatory to reproduce these observables. We also naturally reproduce the observed, flat relation between the mean IRX and the UV luminosity at L-UV > 10(9.5) L-circle dot. Finally, we perform predictions of the UV properties and detectability of IR-selected samples and the vice versa, and discuss the results in the context of the UV-rest-frame and sub-millimetre surveys of the next decade.

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