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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2022

Cosmic evolution of low-excitation radio galaxies in the LOFAR two-metre sky survey deep fields

R. Kondapally
P.N. Best
  • Fonction : Auteur
R.K. Cochrane
  • Fonction : Auteur
J. Sabater
K.J. Duncan
  • Fonction : Auteur
M.J. Hardcastle
  • Fonction : Auteur
P. Haskell
  • Fonction : Auteur
B. Mingo
  • Fonction : Auteur
H.J.A. Röttgering
  • Fonction : Auteur
D.J.B. Smith
  • Fonction : Auteur
W.L. Williams
  • Fonction : Auteur
M. Bonato
G. Calistro Rivera
  • Fonction : Auteur
F. Gao
C.L. Hale
  • Fonction : Auteur
G.K. Miley
  • Fonction : Auteur
I. Prandoni
L. Wang
  • Fonction : Auteur

Résumé

Feedback from low-excitation radio galaxies (LERGs) plays a key role in the lifecycle of massive galaxies in the local Universe; their evolution, and the impact of these active galactic nuclei on early galaxy evolution, however, remain poorly understood. We use a sample of 10 481 LERGs from the first data release of the LOFAR two-metre Sky Survey Deep Fields, covering ∼25 deg^2, to present the first measurement of the evolution of the radio luminosity function (LF) of LERGs out to z ∼ 2.5; this shows relatively mild evolution. We split the LERGs into those hosted by quiescent and star-forming galaxies, finding a new dominant population of LERGs hosted by star-forming galaxies at high redshifts. The incidence of LERGs in quiescent galaxies shows a steep dependence on stellar mass out to z ∼ 1.5, consistent with local Universe measurements of accretion occurring from cooling of hot gas haloes. The quiescent-LERGs dominate the LFs at z < 1, showing a strong decline in space density with redshift, tracing that of the available host galaxies, while there is an increase in the characteristic luminosity. The star-forming LERG LF increases with redshift, such that this population dominates the space densities at most radio-luminosities by z ∼ 1. The incidence of LERGs in star-forming galaxies shows a much weaker stellar-mass dependence, and increases with redshift, suggesting a different fuelling mechanism compared to their quiescent counterparts, potentially associated with the cold gas supply present in the star-forming galaxies.
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hal-03658876 , version 1 (23-03-2023)

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R. Kondapally, P.N. Best, R.K. Cochrane, J. Sabater, K.J. Duncan, et al.. Cosmic evolution of low-excitation radio galaxies in the LOFAR two-metre sky survey deep fields. Monthly Notices of the Royal Astronomical Society, 2022, 513 (3), pp.3742-3767. ⟨10.1093/mnras/stac1128⟩. ⟨hal-03658876⟩
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