The LOFAR Two-metre Sky Survey Deep Fields. A new analysis of low-frequency radio luminosity as a star-formation tracer in the Lockman Hole region - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2021

The LOFAR Two-metre Sky Survey Deep Fields. A new analysis of low-frequency radio luminosity as a star-formation tracer in the Lockman Hole region

M. Bonato
I. Prandoni
G. de Zotti
  • Fonction : Auteur
P. N. Best
  • Fonction : Auteur
M. Bondi
G. Calistro Rivera
  • Fonction : Auteur
R. K. Cochrane
  • Fonction : Auteur
G. Gürkan
P. Haskell
  • Fonction : Auteur
R. Kondapally
M. Magliocchetti
  • Fonction : Auteur
S. K. Leslie
  • Fonction : Auteur
H. J. A. Röttgering
  • Fonction : Auteur
D. J. B. Smith
  • Fonction : Auteur
L. Wang
  • Fonction : Auteur

Résumé

We have exploited LOFAR deep observations of the Lockman Hole field at 150 MHz to investigate the relation between the radio luminosity of star-forming galaxies (SFGs) and their star-formation rates (SFRs), as well as its dependence on stellar mass and redshift. The adopted source classification, SFRs, and stellar masses are consensus estimates based on a combination of four different spectral energy distribution fitting methods. We note a flattening of the radio spectra of a substantial minority of sources below ∼1.4 GHz. Such sources have thus a lower `radio-loudness' level at 150 MHz than expected from extrapolations from 1.4 GHz using the average spectral index. We found a weak trend towards a lower SFR/L150 MHz ratio for higher stellar mass, M. We argue that such a trend may account for most of the apparent redshift evolution of the L150 MHz/SFR ratio, in line with previous work. Our data indicate a weaker evolution than found by some previous analyses. We also find a weaker evolution with redshift of the specific SFR than found by several (but not all) previous studies. Our radio selection provides a view of the distribution of galaxies in the SFR-M plane complementary to that of optical and near-IR selection. It suggests a higher uniformity of the star-formation history of galaxies than implied by some analyses of optical and near-IR data. We have derived luminosity functions at 150 MHz of both SFGs and radio-quiet (RQ) AGN at various redshifts. Our results are in very good agreement with the T-RECS simulations and with literature estimates. We also present explicit estimates of SFR functions of SFGs and RQ AGN at several redshifts derived from our radio survey data.
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Dates et versions

hal-03585963 , version 1 (10-06-2022)

Identifiants

Citer

M. Bonato, I. Prandoni, G. de Zotti, P. N. Best, M. Bondi, et al.. The LOFAR Two-metre Sky Survey Deep Fields. A new analysis of low-frequency radio luminosity as a star-formation tracer in the Lockman Hole region. Astronomy and Astrophysics - A&A, 2021, 656, 18 pp. ⟨10.1051/0004-6361/202141286⟩. ⟨hal-03585963⟩
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