The Mechanism of Formation of "Odd Radio Circles"

Sergey Y. Poroikov

UDC 351.814.375.3

THE MECHANISM OF FORMATION OF "ODD RADIO CIRCLES" The Mechanism of Formation of "Odd Radio Circles"

АА Аа

Published in Journal of Natural Sciences Research · Volume 9, Issue 4 · Pages 82–99 · Rubric: Astrophysics

Received: 09.10.2024 Accepted: 01.11.2024 Published: 08.12.2024

Authors

Sergey Y. Poroikov

Academic degree: candidate of physical and mathematical sciences

Lomonosov Moscow State University Moscow

ABSTRACT

"Odd radio circles" up to 300 kpc in diameter, containing dozens of spherical clumps ~15 kpc in di-ameter were detected. Warm gas in the radio circles emits in the UV lines of a number of ions (O, Mg, Ne) with a temperature of ~104 K, broadened by the gas dynamics (~200 km/s) caused by the shock wave. Emission in the optical and near-IR ranges is associated with the stellar continuum. The radio circle may be formed by supernova shock waves amplified by the stellar wind of blue stars in a stellar stream ≥109 years old, containing ≥3∙108 stars, formed by a galaxy with a mass of ~1010 M○. Star formation in a stellar stream can be initiated by gas raked by a shock wave (flowing into its tail) formed around the gas corona of a satellite galaxy moving in intergalactic gas.

KEYWORDS

odd radio circles, star streams, supernovae, stellar wind

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Otvetstvennyy redaktor

Elena Titova

titova_en@infra-m.ru

chief editor

Viktor Pitulko

pitulko@rambler.ru

1928

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THE MECHANISM OF FORMATION OF "ODD RADIO CIRCLES" The Mechanism of Formation of "Odd Radio Circles"

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