A sample of giant radio sources from the NVGRC catalog
Olga Zhelenkova, Milena Khoruzhenko

TL;DR
This study identifies and characterizes giant radio sources from the NVGRC catalog using visual inspection and compares their properties across redshifts, revealing insights into their morphology, environment, and evolutionary phases.
Contribution
The paper presents a new sample of 125 previously unidentified giant radio sources and analyzes their morphological and environmental properties in detail.
Findings
48% of inspected sources are giant radio sources
33% of sources show fading features
25% exhibit signs of restarted activity
Abstract
We present the results of a search for megaparsec-scale sources in the NVGRC catalog of candidates of giant radio source (GRS) based on the NVSS sky survey. We visually inspected 370 NVGRC sources, as well as radio sources falling within a neighborhood of about one square degree around the target object. In the studied sample, 48% of objects were classified as giant radio sources, 14% as sources with a projected linear size of less than 0.72 Mpc, and 38\% as physically unrelated objects combined by the recognition algorithm into one radio source. We identified 197 gaints, of which 72 radio sources are known GRGs or GRQs, and 125 sources were identified by us as GRS for the first time. Comparing the proportion of FRI giants in four redshift bins, we found that for z<0.05, the proportions of FRI and FRII sources were approximately equal, but already at z>0.15 the proportion of FRI giants…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Radio Astronomy Observations and Technology
