The VLA‐COSMOS 3 GHz Large Project: Cosmic star formation history since z similar to 5 - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2017

The VLA‐COSMOS 3 GHz Large Project: Cosmic star formation history since z similar to 5

M. Novak
  • Fonction : Auteur
V. Smolcic
  • Fonction : Auteur
J. Delhaize
  • Fonction : Auteur
I. Delvecchio
  • Fonction : Auteur
G. Zamorani
N. Baran
M. Bondi
P. Capak
C. L. Carilli
  • Fonction : Auteur
P. Ciliegi
  • Fonction : Auteur
F. Civano
  • Fonction : Auteur
A. Karim
  • Fonction : Auteur
O. Le Fevre
S. Marchesi
  • Fonction : Auteur
H. Mccracken
  • Fonction : Auteur
O. Miettinen
  • Fonction : Auteur
M. Salvato
  • Fonction : Auteur
M. Sargent
  • Fonction : Auteur
E. Schinnerer

Résumé

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 similar to 5 based on approximately 6000 detections with reliable optical counterparts. This is currently the largest radio‐selected sample available out to z similar to 5 across an area of 2 square degrees with a sensitivity of rms approximate to 2.3 mu Jy 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 L‐1.4 (GHz) proportional to /(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 similar to 5. Our data suggest that the SFRD history peaks between 2 < z < 3 and that the ultraluminous infrared galaxies (100 M‐circle dot yr(‐1) < SFR < 1000 M‐circle dot yr(‐1)) contribute up to similar to 25% to the total SFRD in the same redshift range. Hyperluminous infrared galaxies (SFR > 1000 M fi yr 1) contribute an additional less than or similar to 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 greater than or similar to 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.
Fichier principal
Vignette du fichier
1703.09724.pdf (1.71 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-01678372 , version 1 (07-05-2018)

Identifiants

Citer

M. Novak, V. Smolcic, J. Delhaize, I. Delvecchio, G. Zamorani, et al.. The VLA‐COSMOS 3 GHz Large Project: Cosmic star formation history since z similar to 5. Astronomy and Astrophysics - A&A, 2017, 602, ⟨10.1051/0004-6361/201629436⟩. ⟨hal-01678372⟩
157 Consultations
34 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More