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A unified empirical model for infrared galaxy counts based on observed physical evolution of distant galaxies

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arxiv 1208.6512 v2 pith:4UN3LTD3 submitted 2012-08-31 astro-ph.CO

A unified empirical model for infrared galaxy counts based on observed physical evolution of distant galaxies

Matthieu B\'ethermin , Emanuele Daddi , Georgios Magdis , Mark T Sargent , Yashar Hezaveh , David Elbaz , Damien Le Borgne , James Mullaney
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Maurilio Pannella V\'eronique Buat Vassilis Charmandaris Guilaine Lagache Douglas Scott
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classification astro-ph.CO
keywords countsgalaxiesmodelevolutiongalaxyempiricalherschelinfrared
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We reproduce the mid-infrared to radio galaxy counts with a new empirical model based on our current understanding of the evolution of main-sequence (MS) and starburst (SB) galaxies. We rely on a simple Spectral Energy Distribution (SED) library based on Herschel observations: a single SED for the MS and another one for SB, getting warmer with redshift. Our model is able to reproduce recent measurements of galaxy counts performed with Herschel, including counts per redshift slice. This agreement demonstrates the power of our 2 Star-Formation Modes (2SFM) decomposition for describing the statistical properties of infrared sources and their evolution with cosmic time. We discuss the relative contribution of MS and SB galaxies to the number counts at various wavelengths and flux densities. We also show that MS galaxies are responsible for a bump in the 1.4 GHz radio counts around 50 {\mu}Jy. Material of the model (predictions, SED library, mock catalogs...) is available online at http://irfu.cea.fr/Sap/Phocea/Page/index.php?id=537.

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Cited by 2 Pith papers

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    Quiescent galaxies cluster more strongly than star-forming ones by 0.5-1 dex after halo-mass matching, with one-halo conformity up to z~2 that disappears at higher redshifts.

  2. Can current models predict the local black hole merger rate?

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    Theoretical predictions for local BBH merger rates exceed observations by a factor >10 under conservative SFRD and metallicity assumptions, indicating need for revisions in stellar evolution.