Giant radio galaxies in the LoTSS Bo\"otes deep field
Marco Simonte, Heinz Andernach, Marcus Br\"uggen, Dominik Schwarz,, Isabella Prandoni, Anthony G. Willis

TL;DR
This study identifies and characterizes 74 giant radio galaxies in the LoTSS Boötes deep field, analyzing their properties, host galaxy accretion states, and environments to better understand their nature and distribution.
Contribution
First comprehensive catalog and analysis of GRGs in the LoTSS Boötes field, including their sizes, radio properties, host galaxy accretion modes, and environmental context.
Findings
74 GRGs identified with sizes >0.7 Mpc
Most GRG hosts show radiatively inefficient accretion
No significant environmental differences compared to other radio galaxies
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…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Radio Astronomy Observations and Technology · Astronomy and Astrophysical Research
