Giant radio galaxies in the LoTSS Boötes deep field

Abstract

Giant radio galaxies (GRGs) are radio galaxies that have projected linear extents of more than 700 kpc or 1 Mpc, depending on definition. We have carried out a careful visual inspection in search of GRGs of the Bootes LOFAR Deep Field (BLDF) image at 150 MHz. We identified 74 GRGs with a projected size larger than 0.7 Mpc of which 38 are larger than 1 Mpc. The resulting GRG sky density is about 2.8 (1.43) GRGs per square degree for GRGs with linear size larger than 0.7 (1) Mpc. We studied their radio properties and the accretion state of the host galaxies using deep optical and infrared survey data and determined flux densities for these GRGs from available survey images at both 54 MHz and 1.4 GHz to obtain integrated radio spectral indices. We show the location of the GRGs in the P-D diagram. The accretion mode onto the central black holes of the GRG hosts is radiatively inefficient suggesting that the central engines are not undergoing massive accretion at the time of the emission. Interestingly, 14 out of 35 GRGs for which optical spectra are available show a moderate star formation rate. Based on the number density of optical galaxies taken from the DESI DR9 photometric redshift catalogue, we found no significant differences between the environments of GRGs and other radio galaxies, at least for redshift up to z = 0.7.

Accepted for publication in MNRAS. 23 pages, 16 figures, 3 tables

References in corpus (31)

• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• The LOFAR Two-metre Sky Survey -- V. Second data release
• The unWISE Catalog: Two Billion Infrared Sources from Five Years of WISE Imaging
• unWISE: unblurred coadds of the WISE imaging
• The CatWISE2020 Catalog
• The Rapid ASKAP Continuum Survey I: Design and First Results
• The LOFAR Two Meter Sky Survey: Deep Fields, I -- Direction-dependent calibration and imaging
• WISE x SuperCOSMOS photometric redshift catalog: 20 million galaxies over 3pi steradians
• The LOFAR Two Metre Sky Survey: Deep Fields Data Release 1 -- III. Host-galaxy identifications and value added catalogues
• FRICAT: A FIRST catalog of FRI radio galaxies
• Two new catalogs of blazar candidates in the WISE infrared sky
• Hydrodynamical Backflow in X-shaped Radio Galaxy PKS 2014-55
• A multifrequency study of giant radio sources-II. Spectral ageing analysis of the lobes of selected sources
• On the relationship between a giant radio galaxy MSH 05-22 and the ambient large-scale galaxy structure
• Accretion mode versus radio morphology in the LOFAR Deep Fields
• A catalogue of photometric redshifts for the SDSS-DR9 galaxies
• Giant radio galaxies - II. Tracers of large-scale structure
• MRC B0319-454: Probing the large-scale structure with a giant radio galaxy
• The discovery of a radio galaxy of at least 5 Mpc
• Radio observations of the merging galaxy cluster system Abell 3391-Abell 3395
• A multifrequency study of giant radio sources III. Dynamical age vs. spectral age of the lobes of selected sources
• A multifrequency study of giant radio sources I. Low-frequency Giant Metrewave Radio Telescope observations of selected sources
• MIGHTEE: Are giant radio galaxies more common than we thought?
• J1649+2635: A Grand-Design Spiral with a Large Double-Lobed Radio Source
• The new sample of giant radio sources II. Update of optical counterparts, further spectroscopy of identified faint host galaxies, high-frequency radio maps, and polarisation properties of the sources
• LOFAR low-band antenna observations of the 3C295 and Bootes fields: source counts and ultra-steep spectrum sources
• Probing dark energy models with extreme pairwise velocities of galaxy clusters from the DEUS-FUR simulations
• Giant radio quasars: sample and basic properties
• Long-term FRII jet evolution in dense environments
• PRAiSE: Resolved spectral evolution in simulated radio sources
• Stellar populations in hosts of giant radio galaxies and their neighbouring galaxies

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