The bulk motion of gas in the core of the Centaurus galaxy cluster

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F25%3A00144415" target="_blank" >RIV/00216224:14310/25:00144415 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.nature.com/articles/s41586-024-08561-z" target="_blank" >https://www.nature.com/articles/s41586-024-08561-z</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41586-024-08561-z" target="_blank" >10.1038/s41586-024-08561-z</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The bulk motion of gas in the core of the Centaurus galaxy cluster

Popis výsledku v původním jazyce

Galaxy clusters contain vast amounts of hot ionized gas known as the intracluster medium (ICM). In relaxed cluster cores, the radiative cooling time of the ICM is shorter than the age of the cluster. However, the absence of line emission associated with cooling suggests heating mechanisms that offset the cooling, with feedback from active galactic nuclei (AGNs) being the most likely source(1,2). Turbulence and bulk motions, such as the oscillating ('sloshing') motion of the core gas in the cluster potential well, have also been proposed as mechanisms for heat distribution from the outside of the core(3,4). Here we present X-ray spectroscopic observations of the Centaurus galaxy cluster with the X-Ray Imaging and Spectroscopy Mission satellite. We find that the hot gas flows along the line of sight relative to the central galaxy, with velocities from 130kms(-1) to 310kms(-1) within about 30kpc of the centre. This indicates bulk flow consistent with core gas sloshing. Although the bulk flow may prevent excessive accumulation of cooled gas at the centre, it could distribute the heat injected by the AGN and bring in thermal energy from the surrounding ICM. The velocity dispersion of the gas is found to be only less than or similar to 120kms(-1) in the core, even within about 10kpc of the AGN. This suggests that the influence of the AGN on the surrounding ICM motion is limited in the cluster.

Název v anglickém jazyce

The bulk motion of gas in the core of the Centaurus galaxy cluster

Popis výsledku anglicky

Galaxy clusters contain vast amounts of hot ionized gas known as the intracluster medium (ICM). In relaxed cluster cores, the radiative cooling time of the ICM is shorter than the age of the cluster. However, the absence of line emission associated with cooling suggests heating mechanisms that offset the cooling, with feedback from active galactic nuclei (AGNs) being the most likely source(1,2). Turbulence and bulk motions, such as the oscillating ('sloshing') motion of the core gas in the cluster potential well, have also been proposed as mechanisms for heat distribution from the outside of the core(3,4). Here we present X-ray spectroscopic observations of the Centaurus galaxy cluster with the X-Ray Imaging and Spectroscopy Mission satellite. We find that the hot gas flows along the line of sight relative to the central galaxy, with velocities from 130kms(-1) to 310kms(-1) within about 30kpc of the centre. This indicates bulk flow consistent with core gas sloshing. Although the bulk flow may prevent excessive accumulation of cooled gas at the centre, it could distribute the heat injected by the AGN and bring in thermal energy from the surrounding ICM. The velocity dispersion of the gas is found to be only less than or similar to 120kms(-1) in the core, even within about 10kpc of the AGN. This suggests that the influence of the AGN on the surrounding ICM motion is limited in the cluster.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GX21-13491X" target="_blank" >GX21-13491X: Zkoumání žhavého vesmíru a porozumění kosmické zpětné vazbě</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nature

ISSN

0028-0836

e-ISSN

1476-4687

Svazek periodika

638

Číslo periodika v rámci svazku

8050

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

14

Strana od-do

365-378

Kód UT WoS článku

001509637600001

EID výsledku v databázi Scopus

2-s2.0-85218495195