Россия
Россия
УДК 520.2 Телескопы
УДК 524.74 Типы галактик
УДК 524.7-33 Размеры. Светимость. Свойства состояния
УДК 524.8 Вселенная. Метагалактика. Космология
ГРНТИ 41.29 Космология
ГРНТИ 41.17 Астрофизика
ГРНТИ 41.51 Обсерватории. Инструменты, приборы и методы астрономических наблюдений
ОКСО 03.05.01 Астрономия
ОКСО 03.06.01 Физика и астрономия
ББК 223 Физика
ТБК 61 Физико-математические науки
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
The NVGRC catalog contains radio sources selected by a pattern recognition algorithm as candidates for giant radio sources (GRSs). Besides genuine GRSs, the catalog includes sources with sizes below 0.7 Mpc and objects erroneously classified as single sources. We examined 370 NVGRC sources along with radio sources located within one degree of the target. The results showed that 48% of objects are genuine GRSs, 14 % are compact sources with sizes under 0.7 Mpc, and 38% are misclassified objects. Our study identified 197 giant sources, including 72 previously known GRSs and 125 newly confirmed GRSs. Analysis of the FRItoFRII ratio in the sample revealed nearly equal proportions of these types at $z < 0.05$. At higher redshifts ($z > 0.15$), there is a sharp decrease in the proportion of FRI sources. The predominance of FRII sources in GRS catalogs likely stems from observational selection effects caused by the sensitivity limitations of current radio surveys. Environmental analysis of the GRS sample demonstrated that 39% have close neighbours within 50 kpc (based on photometric redshifts), 28 % reside in groups or clusters according to published data. When considering radio sources with deformed lobes, nearly 70% of GRSs appear to be located in relatively dense environments.
active galaxies: giant radio sources; general radio continuum
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