Accretion mode versus radio morphology in the LOFAR Deep Fields

Mingo, B.; Croston, J. H.; Best, P. N.; Duncan, K. J.; Hardcastle, M. J.; Kondapally, R.; Prandoni, I.; Sabater, J.; Shimwell, T. W.; Williams, W. L.; Baldi, R. D.; Bonato, M.; Bondi, M.; Dabhade, P.; Gürkan, G.; Ineson, J.; Magliocchetti, M.; Miley, G.; Pierce, J. C. S.; Röttgering, H. J. A.

doi:10.48550/arxiv.2201.04433

Cited by 3 publications

(2 citation statements)

References 141 publications

(246 reference statements)

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“…8. Recent work by Mingo et al (2022) found a tail of LERGs with high sSFRs based on a study of the resolved radio-loud AGN within LoTSS-Deep; this is consistent with our study that finds the existence of a significant population of LERGs hosted by star-forming galaxies.…”

Section: Prevalence Of Lergs In Star-forming and Quiescent Galaxiessupporting

confidence: 93%

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

Kondapally

Best

Cochrane

et al. 2022

Monthly Notices of the Royal Astronomical Society

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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-meter Sky Survey Deep Fields, covering ∼ 25 deg2, 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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Section: Prevalence Of Lergs In Star-forming and Quiescent Galaxiessupporting

confidence: 93%

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

Kondapally

Best

Cochrane

et al. 2022

Monthly Notices of the Royal Astronomical Society

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“…While our sample mainly consists of intermediate disc and star-forming disc galaxies, the sample of O'Sullivan et al ( 2015) is dominated by spheroidal ones. Making the same comparison with the faint total power radio sky at longer wavelengths shows a distribution very similar to ours (Mingo et al 2022). The main difference arises in the flux range that the different samples cover.…”

Section: Discussionsupporting

confidence: 71%

The Apertif science verification campaign - Characteristics of polarised radio sources

Adebahr,

Berger,

Adams

et al. 2022

Preprint

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Context. The characteristics of the polarised radio sky are a key ingredient in constraining evolutionary models of magnetic fields in the Universe and their role in feedback processes. The origin of the polarised emission and the characteristics of the intergalactic medium on the line of sight can be investigated using large samples of polarised sources. Ancillary infrared (IR) and optical data can be used to study the nature of the emitting objects. Aims. We analyse five early science datasets from the APERture Tile in Focus (Apertif) phased array feed system to verify the polarisation capabilities of Apertif in view of future larger data releases. We aim to characterise the source population of the polarised sky in the L-Band using polarised source information in combination with IR and optical data. Methods. We use automatic routines to generate full field-of-view Q-and U-cubes and perform Rotation Measure (RM)-Synthesis, source finding, and cross-matching with published radio, optical, and IR data to generate polarised source catalogues. All sources were inspected individually by eye for verification of their IR and optical counterparts. Spectral energy distribution (SED)-fitting routines were used to determine photometric redshifts, star-formation rates, and galaxy masses. IR colour information was used to classify sources as active galactic nuclei (AGN) or star-forming-dominated and early-or late-type. Results. We surveyed an area of 56 deg 2 and detected 1357 polarised source components in 1170 sources. The fraction of polarised sources is 10.57 % with a median fractional polarisation of 4.70 ± 0.14 %. We confirmed the reliability of the Apertif measurements by comparing them with polarised cross-identified NVSS sources. Average RMs of the individual fields lie within the error of the best Milky Way foreground measurements. All of our polarised sources were found to be dominated by AGN activity in the radio regime with most of them being radio-loud (79 %) and of the Fanaroff-Riley (FR)II class (87 %). The host galaxies of our polarised source sample are dominated by intermediate disc and star-forming disc galaxies. The contribution of star formation to the radio emission is on the order of a few percent for ≈ 10 % of the polarised sources while for ≈ 90 % it is completely dominated by the AGN. We do not see any change in fractional polarisation for different star-formation rates of the AGN host galaxies. Conclusions. The Apertif system is suitable for large-area high-sensitivity polarised sky surveys. The data products of the polarisation analysis pipeline can be used to investigate the Milky Way magnetic field on projected scales of several arcminutes as well as the origin of the polarised emission in AGN and the properties of their host galaxies.

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Cosmic evolution of low-excitation radio galaxies in the LOFAR Two-meter Sky Survey Deep Fields

Kondapally,

Best,

Cochrane

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

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-meter 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.

show abstract

Accretion mode versus radio morphology in the LOFAR Deep Fields

Cited by 3 publications

References 141 publications

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

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

The Apertif science verification campaign - Characteristics of polarised radio sources

Cosmic evolution of low-excitation radio galaxies in the LOFAR Two-meter Sky Survey Deep Fields

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