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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742519.0, MPI für Astronomie / Publikationen_mpia
The VLA-COSMOS 3 GHz Large Project: Cosmic star formation history since z 5
Authors:Novak, M.; Smolčić, V.; Delhaize, J.; Delvecchio, I.; Zamorani, G.; Baran, N.; Bondi, M.; Capak, P.; Carilli, C. L.; Ciliegi, P.; Civano, F.; Ilbert, O.; Karim, A.; Laigle, C.; Le Fèvre, O.; Marchesi, S.; McCracken, H.; Miettinen, O.; Salvato, M.; Sargent, M.; Schinnerer, E.; Tasca, L.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Astronomy and Astrophysics
Start Page:id. A5 (17 pp)
Audience:Not Specified
Abstract / Description: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 μJy beam-1. 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 L1.4 GHz ∝ (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 (100 M yr-1 < SFR < 1000 M yr-1) contribute up to 25% to the total SFRD in the same redshift range. Hyperluminous infrared galaxies (SFR > 1000 M yr-1) 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 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
Free Keywords:galaxies: evolution; galaxies: star formation; cosmology: observations; radio continuum: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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