A population of galaxy-scale jets discovered using LOFAR

Abstract

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 $3\times 10^{22}$ and $1.5\times 10^{25}{\text{ W Hz}}^{-1}$ 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.

23 pages, accepted by MNRAS

References in corpus (34)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The Host Galaxies and Classification of Active Galactic Nuclei
• Heating Hot Atmospheres with Active Galactic Nuclei
• Astrophysics Source Code Library
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• A Survey of Kiloparsec-Scale Radio Outflows in Radio-Quiet Active Galactic Nuclei
• Revisiting the Fanaroff-Riley dichotomy and radio-galaxy morphology with the LOFAR Two-Metre Sky Survey (LoTSS)
• Prevalence of radio jets associated with galactic outflows and feedback from quasars
• A pilot study of the radio-emitting AGN population: the emerging new class of FR0 radio-galaxies
• High-energy particle acceleration at the radio-lobe shock of Centaurus A
• An XMM-Newton study of the environments, particle content and impact of low-power radio galaxies
• A radio spectral index map and catalogue at 147-1400 MHz covering 80 per cent of the sky
• Relativistic jet feedback II: Relationship to gigahertz peak spectrum and compact steep spectrum radio galaxies
• The MIXR sample: AGN activity versus star formation across the cross-correlation of WISE, 3XMM, and FIRST/NVSS
• Observed properties of FRII quasars and radio galaxies at z < 1.0
• FR0CAT: a FIRST catalog of FR0 radio galaxies
• A representative survey of the dynamics and energetics of FRII radio galaxies
• The Circum-Galactic Medium of MASsive Spirals II: Probing the Nature of Hot Gaseous Halo around the Most Massive Isolated Spiral Galaxies
• Radio bubbles in the composite AGN-starburst galaxy NGC6764
• The SLUGGS Survey: stellar masses and effective radii of early-type galaxies from Spitzer Space Telescope 3.6$\mu$m imaging
• Exceptional AGN-driven turbulence inhibits star formation in the 3C 326N radio-galaxy
• Markarian 6: shocking the environment of an intermediate Seyfert
• Chandra evidence for AGN feedback in the spiral galaxy NGC 6764
• Herschel-ATLAS: Far-infrared properties of radio-loud and radio-quiet quasars
• The Dependence of AGN Activity on Environment in SDSS
• The many faces of LINER-like galaxies: a WISE view
• Shocks, Seyferts and the SNR connection: a Chandra observation of the Circinus galaxy
• What Powers the Most Relativistic Jets? II: Flat Spectrum Radio Quasars
• The large-scale environment of FR 0 radio galaxies
• COMP2CAT: hunting compact double radio sources in the local Universe
• The Discovery of a Low-Luminosity SPIRAL DRAGN
• Galaxies and Supermassive Black Holes at z <= 0.1: The Velocity Dispersion Function
• High resolution observations of Cen A: Yellow and red supergiants in a region of jet-induced star formation?

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• RAD@home citizen science discovery of an AGN spewing a large unipolar radio bubble onto its merging companion galaxy
• The interplay between radio AGN activity and their host galaxies
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