КФУ. Карточка публикации. A snapshot of the oldest active galactic nuclei feedback phases

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A SNAPSHOT OF THE OLDEST ACTIVE GALACTIC NUCLEI FEEDBACK PHASES

Форма представления

Статьи в зарубежных журналах и сборниках

Год публикации

2021

Язык

английский

Авторы, сотрудники КФУ

Бикмаев Ильфан Фяритович, автор

Библиографическое описание на языке оригинала

Brienza M, Shimwell T.W, de Gasperin F, A snapshot of the oldest active galactic nuclei feedback phases//Nature Astronomy. - 2021. - Vol.5, Is.12, -p.1261-1267 .

Аннотация

Active galactic nuclei inject large amounts of energy into their host galaxies and surrounding environment, shaping their properties and evolution1,2. In particular, active-galactic-nuclei jets inflate cosmic-ray lobes, which can rise buoyantly as light `bubbles' in the surrounding medium3, displacing and heating the encountered thermal gas and thus halting its spontaneous cooling. These bubbles have been identified in a wide range of systems4,5. However, due to the short synchrotron lifetime of electrons, the most advanced phases of their evolution have remained observationally unconstrained, preventing us from fully understand their coupling with the external medium, and thus active galactic nuclei feedback. Simple subsonic hydrodynamic models6,7 predict that the pressure gradients, naturally present around the buoyantly rising bubbles, transform them into toroidal structures, resembling mushroom clouds in a stratified atmosphere. The way and timescales on which these tori will eventually disrupt depend on various factors including magnetic fields and plasma viscosity8,9. Here we report observations below 200 MHz, sensitive to the oldest radio-emitting particles, showing the late evolution of multiple generations of cosmic-ray active-galactic-nuclei bubbles in a galaxy group with unprecedented level of detail. The bubbles' buoyancy power can efficiently offset the radiative cooling of the intragroup medium. However, the bubbles still have not thoroughly mixed with the thermal gas, after hundreds of million years, probably under the action of magnetic fields.

Ключевые слова

galaxy clusters, AGN, radio, optical and X-ray observations

Название журнала

Nature Astronomy

URL

https://www.nature.com/articles/s41550-021-01491-0

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https://repository.kpfu.ru/?p_id=260991

Полная запись метаданных

Поле DC	Значение	Язык
dc.contributor.author	Бикмаев Ильфан Фяритович	ru_RU
dc.date.accessioned	2021-01-01T00:00:00Z	ru_RU
dc.date.available	2021-01-01T00:00:00Z	ru_RU
dc.date.issued	2021	ru_RU
dc.identifier.citation	Brienza M, Shimwell T.W, de Gasperin F, A snapshot of the oldest active galactic nuclei feedback phases//Nature Astronomy. - 2021. - Vol.5, Is.12, -p.1261-1267 .	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/?p_id=260991	ru_RU
dc.description.abstract	Nature Astronomy	ru_RU
dc.description.abstract	Active galactic nuclei inject large amounts of energy into their host galaxies and surrounding environment, shaping their properties and evolution1,2. In particular, active-galactic-nuclei jets inflate cosmic-ray lobes, which can rise buoyantly as light `bubbles' in the surrounding medium3, displacing and heating the encountered thermal gas and thus halting its spontaneous cooling. These bubbles have been identified in a wide range of systems4,5. However, due to the short synchrotron lifetime of electrons, the most advanced phases of their evolution have remained observationally unconstrained, preventing us from fully understand their coupling with the external medium, and thus active galactic nuclei feedback. Simple subsonic hydrodynamic models6,7 predict that the pressure gradients, naturally present around the buoyantly rising bubbles, transform them into toroidal structures, resembling mushroom clouds in a stratified atmosphere. The way and timescales on which these tori will eventually disrupt depend on various factors including magnetic fields and plasma viscosity8,9. Here we report observations below 200 MHz, sensitive to the oldest radio-emitting particles, showing the late evolution of multiple generations of cosmic-ray active-galactic-nuclei bubbles in a galaxy group with unprecedented level of detail. The bubbles' buoyancy power can efficiently offset the radiative cooling of the intragroup medium. However, the bubbles still have not thoroughly mixed with the thermal gas, after hundreds of million years, probably under the action of magnetic fields.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	galaxy clusters	ru_RU
dc.subject	AGN	ru_RU
dc.subject	radio	ru_RU
dc.subject	optical and X-ray observations	ru_RU
dc.title	A snapshot of the oldest active galactic nuclei feedback phases	ru_RU
dc.type	Статьи в зарубежных журналах и сборниках	ru_RU