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

Abstract

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 (SFR), 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 modeled 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 a good overall agreement with the measurements of the IR luminosity function up to z~3 and the UV luminosity functions up to z~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${}_{\mathrm{UV}}>$10${}^{9.5}$ L${}_{\odot }$. 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-millimeter surveys of the next decade.

Accepted for publication in MNRAS; 14 pages; 7 figures

References in corpus (6)

• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
• Multi-Wavelength Constraints on the Cosmic Star Formation History from Spectroscopy: the Rest-Frame UV, H-alpha, and Infrared Luminosity Functions at Redshifts 1.9<z<3.4
• The 0.4 < z < 1.3 star formation history of the Universe as viewed in the far-infrared
• The Evolution of the UV Luminosity Function from z ~ 0.75 to z ~ 2.5 using HST ERS WFC3/UVIS Observations

Cited by in corpus (8)

• An Objective Definition for the Main Sequence of Star-Forming Galaxies
• AGN and their host galaxies in the local Universe: two mass independent Eddington ratio distribution functions characterize black hole growth
• Spatial distribution of stellar mass and star formation activity at 0.2<z<1.2 across and along the Main Sequence
• Dust attenuation up to z~2 in the AKARI North Ecliptic Pole Deep Field
• UV dust attenuation as a function of stellar mass and its evolution with redshift
• Galaxy And Mass Assembly: the evolution of the cosmic spectral energy distribution from z = 1 to z = 0
• The effect of disk inclination on the Main Sequence of star forming galaxies
• A minimal empirical model for the cosmic far-infrared background anisotropies