COMP2<i>CAT</i>: hunting compact double radio sources in the local Universe

Jimenez-Gallardo, A.; Massaro, F.; Capetti, A.; Prieto, M. A.; Paggi, A.; Baldi, Ranieri D.; Grossová, Romana; Ostorero, L.; Siemiginowska, Aneta; Viada, Stefano

doi:10.1051/0004-6361/201935104

Cited by 16 publications

(12 citation statements)

References 56 publications

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“…small sources with very weak jets, and low-luminosity FRIIs (e.g. Best & Heckman 2012;Fernandes et al 2015;Baldi et al 2015;Capetti et al 2017b;Miraghaei & Best 2017;Mingo et al 2019;Jimenez-Gallardo et al 2019;Macconi et al 2020;Pierce et al 2020;Grandi et al 2021;Vardoulaki et al 2021). Environmental studies have also demonstrated links between environment and both radio morphology and accretion mode (Gendre et al 2013;Ineson et al 2015;Croston et al 2019;Vardoulaki et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Accretion mode versus radio morphology in the LOFAR Deep Fields

Mingo,

Croston,

Best

et al. 2022

Preprint

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Radio-loud active galaxies have two accretion modes [radiatively inefficient (RI) and radiatively efficient (RE)], with distinct optical and infrared signatures, and two jet dynamical behaviours, which in arcsec-to arcmin-resolution radio surveys manifest primarily as centre-or edge-brightened structures [Fanaroff-Riley (FR) class I and II]. The nature of the relationship between accretion mode and radio morphology (FR class) has been the subject of long debate. We present a comprehensive investigation of this relationship for a sample of 286 well-resolved radio galaxies in the LOFAR Two-metre Sky Survey Deep Fields (LoTSS-Deep) first data release, for which robust morphological and accretion mode classifications have been made. We find that two-thirds of luminous FRII radio galaxies are RI, and identify no significant differences in the visual appearance or source dynamic range (peak/mean surface brightness) of the RI and RE FRIIs, demonstrating that both RI and RE systems can produce FRII structures. We also find a significant population of low-luminosity FRIIs (predominantly RI), supporting our earlier conclusion that FRII radio structures can be produced at all radio luminosities. We demonstrate that in the luminosity range where both morphologies are present, the probability of producing FRI or FRII radio morphology is directly linked to stellar mass, while across all morphologies and luminosities, RE accretion occurs in systems with high specific star formation rate, presumably because this traces fuel availability. In summary, the relationship between accretion mode and radio morphology is very indirect, with host-galaxy environment controlling these two key parameters in different ways.

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Section: Introductionmentioning

confidence: 99%

Accretion mode versus radio morphology in the LOFAR Deep Fields

Mingo,

Croston,

Best

et al. 2022

Preprint

Self Cite

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“…Recently, some authors have started looking into physically small radio galaxies (e.g. Jarvis et al 2019; Jimenez-★ E-mail: brendan.webster@open.ac.uk Gallardo et al 2019;Webster et al 2021) where observations of shock fronts (Croston et al 2009;Mingo et al 2011Mingo et al , 2012 provide evidence of direct feedback between jets and the host ISM. These sources may provide an opportunity for better understanding how feedback from radio galaxies affects galaxy evolution.…”

Section: Introductionmentioning

confidence: 99%

Investigating the spectra and physical nature of galaxy scale jets

Webster

Croston

Harwood

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Previous studies have shown that physically small, low-luminosity radio galaxies, which we refer to as galaxy scale jets (GSJ), could potentially have a significant effect upon the host galaxy’s evolution. Using 6″ resolution images taken from the first release of the LOFAR Two Metre Sky Survey (LoTSS DR1), we identified a representative sample of nine potential GSJ for which we obtained high-resolution, 2-4 GHz data using the Karl G. Jansky Very Large Array (VLA). Using these data we aim to verify the GSJ nature of these sources as well as investigating the potential role of feedback. Our VLA images reveal a diversity of structures, confirm the hosts for four of the sources and find that a fifth is the first known example of a galaxy-scale remnant showing that some radio galaxies never grow beyond the GSJ stage. We also derive spectral ages and the first estimates of the lobe expansion speeds of GSJ. We find our GSJ have maximum spectral ages of 60 Myr with most between about 5 and 20 Myr, consistent with being located along an evolutionary path joining compact sources and larger radio galaxies. We find lobe advance speeds a few times the local sound speed, with most GSJ predicted to be driving strong shocks into their environment and having a significant impact upon the host’s evolution. Our discovery of a remnant GSJ, which will eventually transfer all of its energy directly into the local environment, represents an important and previously hidden aspect of AGN life cycles.

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“…Bicknell et al 2018;Tadhunter 2016b), along with some studies of intermediate-size radio structures (e.g. Jarvis et al 2019;Jimenez-Gallardo et al 2019). However, the advent of telescopes such as the International LOw Frequency ARray (LOFAR) Telescope, with its combination of high sensitivity to both compact and extended emission (Shimwell et al 2017), allows for the systematic identification of sources with sizes on scales similar to that of the host galaxy, together with the study of the potential effects these sources can have upon their host environments.…”

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confidence: 99%

A population of galaxy-scale jets discovered using LOFAR

Webster

Croston

Mingo

et al. 2020

Monthly Notices of the Royal Astronomical Society

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The effects of feedback from high luminosity radio-loud AGN have been extensively discussed in the literature, but feedback from low-luminosity radio-loud AGN is less well understood. The advent of high sensitivity, high angular resolution, large field of view telescopes such as LOFAR is now allowing wide-area studies of such faint sources for the first time. Using the first data release of the LOFAR Two Metre Sky Survey (LoTSS) we report on our discovery of a population of 195 radio galaxies with 150 MHz luminosities between 3 × 1022 and 1.5 × 1025WHz−1 and total radio emission no larger than 80 kpc. These objects, which we term galaxy-scale jets (GSJ), are small enough to be directly influencing the evolution of the host on galaxy scales. We report upon the typical host properties of our sample, finding that 9 per cent are hosted by spirals with the remainder being hosted by elliptical galaxies. Two of the spiral-hosted GSJ are highly unusual with low radio luminosities and FRII-like morphology. The host properties of our GSJ show that they are ordinary AGN observed at a stage in their life shortly after the radio emission has expanded beyond the central regions of the host. Based on our estimates, we find that about half of our GSJ have internal radio lobe energy within an order of magnitude of the ISM energy so that, even ignoring any possible shocks, GSJ are energetically capable of affecting the evolution of the host. The current sample of GSJ will grow in size with future releases of LoTSS and can also form the basis for further studies of feedback from low-luminosity radio sources.

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COMP2CAT: hunting compact double radio sources in the local Universe

Cited by 16 publications

References 56 publications

Accretion mode versus radio morphology in the LOFAR Deep Fields

Accretion mode versus radio morphology in the LOFAR Deep Fields

Investigating the spectra and physical nature of galaxy scale jets

A population of galaxy-scale jets discovered using LOFAR

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