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ANGULAR STRUCTURE OF THE RADIO GALAXY 3C239 IN THE DECAMETER RANGE

ANGULAR STRUCTURE OF THE RADIO GALAXY 3C239 IN THE DECAMETER RANGE

Abstract

We present the results of the observation of the radio galaxy 3C239 with the URAN interferometers at the decameter wavelengths. According to our study, the source in this range consists of two components that coincide in position and size with the lobes of the radio galaxy observed at the decimeter wavelengths, and a compact component corresponding to one of its hot spots. Another hot spot is not detected due to its low flux density at decameter wavelengths. In addition, an extended region of radiation with low surface brightness was detected, which surrounds the source lobes. The size of this halo is 28 arcsec, and its emission at the frequency of 25 MHz is about 20% of the total flux of the radio galaxy. A possible view of spectra of the radio source components and their variation in the range from decameter to decimeter wavelengths are determined. It is noted that in contrast to the high-frequency structure of 3C239, where radiation of the compact hot spots dominates, at decameter wavelengths about 90% of the radio galaxy flux is provided by more extended components — the source lobes and the halo.

Наведено результати спостереження радіогалактики 3C239 інтерферометрами УРАН на де каметрових довжинах хвиль. Згідно з дослідженням, джерело в цьому діапазоні складається з двох компонентів, які збігаються за положенням і розміром з пелюстками радіогалактики, що спостерігаються на дециметрових хвилях, та компактного компонента, що відпові дає одній з її гарячих плям. Інша гаряча пляма не вияв лена через низьку густину потоку. Крім того, була ви явлена протягнена область випромінювання з низькою поверхневою яскравістю, яка охоплює пелюстки джерела. Розмір цього гало становить 28 кутових секунд, а його випромінювання на частоті 25 МГц становить близько 20% від загального потоку радіогалактики. Ви значено можливий вигляд спектрів компонентів радіо джерела та їх змінювання в діапазоні від декаметрових до дециметрових хвиль. Відзначається, що на відміну від високочастотної структури 3C239, де домінує ви промінювання компактних гарячих плям, на декаметрових хвилях близько 90% потоку радіогалактики за безпечується більш протягненими компонентами — пелюстками джерела і гало.

Keywords

decameter model, інтерферометр, interferometer, розподіл яскравості, decameter range, декаметровий діапазон, radio source, brightness distribution, радіоджерело, декаметрова модель

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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