Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 513, Issue 3, Pages 3742-3767Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac1128
Keywords
accretion, accretion discs; galaxies: active; galaxies: evolution; galaxies: jets; galaxies: luminosity function, mass function; radio continuum: galaxies
Categories
Funding
- International LOFAR Telescope (ILT) [LC0 015, LC2 024, LC2 038, LC3 008, LC4 008, LC4 034, LT10 01]
- LOFAR
- CNRS-INSU, Observatoire de Paris and Universit PRIME
- BMBF
- Science Foundation Ireland (SFI), Department of Business, Enterprise and Innovation
- NWO, The Netherlands
- Ministry of Science and Higher Education, Poland
- Science and Technology Facilities Council (STFC) through an STFC [ST/R504737/1]
- UK STFC [ST/R00109X/1, ST/R000794/1, ST/T000295/1]
- Flatiron Institute
- Simons Foundation
- STFC [ST/V000624/1]
- INAF under PRIN SKA/CTA
- Ministero degli Affari Esteri della Cooperazione Internazionale -Direzione Generale per la Promozione del Sistema Paese Progetto di Grande Rilevanza [ZA18GR02]
- European Union [892117]
- National Science Centre [UMO-2018/30/E/ST9/00082]
- Leverhulme Trust through an Early Career Research Fellowship
- INAF under the SKA/CTA PRIN `FORECaST'
- PRIN MAIN STREAM `SAuROS' projects
- ERC Advanced Investigator programme NewClusters [321271, 629.001.024]
- Netherlands Organisation for Scientific Research (NWO)
- Marie Curie Actions (MSCA) [892117] Funding Source: Marie Curie Actions (MSCA)
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Feedback from low-excitation radio galaxies (LERGs) is important for the evolution of massive galaxies. They can be separated into LERGs hosted by quiescent and star-forming galaxies, with the latter dominating at high redshifts.
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 similar to 25 deg(2), to present the first measurement of the evolution of the radio luminosity function (LF) of LERGs out to z similar to 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 similar to 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 similar to 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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