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The VLA-COSMOS 3 GHz Large Project: The cosmic star formation history since z~5

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arxiv 1703.09724 v2 pith:275UDDKW submitted 2017-03-28 astro-ph.GA

The VLA-COSMOS 3 GHz Large Project: The cosmic star formation history since z~5

M. Novak , V. Smolcic , J. Delhaize , I. Delvecchio , G. Zamorani , N. Baran , M. Bondi , P. Capak
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C. L. Carilli P. Ciliegi F. Civano O. Ilbert A. Karim C. Laigle O. Le Fevre S. Marchesi H. McCracken O. Miettinen M. Salvato M. Sargent E. Schinnerer L. Tasca
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classification astro-ph.GA
keywords galaxiesradioluminosityredshiftsfrdformationhistoryinfrared
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We make use of the deep Karl G. Jansky Very Large Array (VLA) COSMOS radio observations at 3 GHz to infer radio luminosity functions of star-forming galaxies up to redshifts of z~5 based on approximately 6000 detections with reliable optical counterparts. This is currently the largest radio-selected sample available out to z~5 across an area of 2 square degrees with a sensitivity of rms=2.3 ujy/beam. By fixing the faint and bright end shape of the radio luminosity function to the local values, we find a strong redshift trend that can be fitted with a pure luminosity evolution L~(1+z)^{(3.16 +- 0.2)-(0.32 +- 0.07) z}. We estimate star formation rates (SFRs) from our radio luminosities using an infrared (IR)-radio correlation that is redshift dependent. By integrating the parametric fits of the evolved luminosity function we calculate the cosmic SFR density (SFRD) history since z~5. Our data suggest that the SFRD history peaks between 2<z<3 and that the ultraluminous infrared galaxies (ULIRGs; 100 Msol/yr<SFR<1000 Msol/yr) contribute up to ~25% to the total SFRD in the same redshift range. Hyperluminous infrared galaxies (HyLIRGs; SFR>1000 Msol/yr) contribute an additional <2% in the entire observed redshift range. We find evidence of a potential underestimation of SFRD based on ultraviolet (UV) rest-frame observations of Lyman break galaxies (LBGs) at high redshifts (z>4) on the order of 15-20%, owing to appreciable star formation in highly dust-obscured galaxies, which might remain undetected in such UV observations.

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Cited by 3 Pith papers

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  1. The VLA-COSMOS 3 GHz Large Project: Polarised source counts and catalogue

    astro-ph.GA 2026-07 unverdicted novelty 4.0

    Deep 3 GHz polarised source counts detect 65 sources (51 deg^{-2}), consistent with 1.4 GHz literature due to spectral index and depolarisation, with a 2σ upper limit of <2.0 deg^{-2} on polarised SFG density.

  2. The PARADIGM Project II: Characterising Nuclear and Diffuse Radio Components in Local U/LIRGs

    astro-ph.GA 2026-05 unverdicted novelty 4.0

    Multi-scale radio observations of 15 local U/LIRGs decompose emission to show nuclear components contribute ~50% on average while diffuse SF-related emission dominates ~80% of total power, with radio excess linked to ...

  3. Cosmology from Clustering of Continuum Galaxies

    astro-ph.CO 2026-06 unverdicted novelty 3.0

    Forecasts angular clustering for a 20,000 sq deg SKAO radio continuum survey reaching O(300-400 million) sources and discusses needed corrections for telescope systematics and population modeling.