Properties of the Hot Ambient Medium of Early-type Galaxies Hosting Powerful Radio Sources

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00116462" target="_blank" >RIV/00216224:14310/20:00116462 - isvavai.cz</a>

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.3847/1538-4357/aba8a8/pdf" target="_blank" >https://iopscience.iop.org/article/10.3847/1538-4357/aba8a8/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/aba8a8" target="_blank" >10.3847/1538-4357/aba8a8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Properties of the Hot Ambient Medium of Early-type Galaxies Hosting Powerful Radio Sources

Popis výsledku v původním jazyce

We present an archival analysis of Chandra X-ray observations for 12 nearby early-type galaxies hosting radio sources with radio power &gt;10(23)W Hz(-1)at 1.4 GHz, similar to the radio power of the radio source in NGC 4261. Previously, in a similar analysis of eight nearby X-ray and optically bright elliptical galaxies, Werner et al. found that NGC 4261 exhibited unusually low central gas entropy compared to the full sample. In the central 0.3 kpc of NGC 4261, the ratio of cooling time to freefall time (t(cool)/t(ff)) is less than 10, indicating that cold clouds may be precipitating out of the hot ambient medium and providing fuel for accretion in the central region. NGC 4261 also hosts the most powerful radio source in the original sample. Because NGC 4261 may represent an important phase during which powerful feedback from a central active galactic nucleus (AGN) is fueled by multiphase condensation in the central kiloparsec, we searched the Chandra archive for analogs to NGC 4261. We present entropy profiles of those galaxies, as well as profiles oft(cool)/t(ff). We find that one of them, IC 4296, exhibits properties similar to NGC 4261, including the presence of only single-phase gas outside ofr similar to 2 kpc and a similar central velocity dispersion. We compare the properties of NGC 4261 and IC 4296 to hydrodynamic simulations of AGN feedback fueled by precipitation. Over the course of those simulations, the single-phase galaxy has an entropy gradient that remains similar to the entropy profiles inferred from our observations.

Název v anglickém jazyce

Properties of the Hot Ambient Medium of Early-type Galaxies Hosting Powerful Radio Sources

Popis výsledku anglicky

We present an archival analysis of Chandra X-ray observations for 12 nearby early-type galaxies hosting radio sources with radio power &gt;10(23)W Hz(-1)at 1.4 GHz, similar to the radio power of the radio source in NGC 4261. Previously, in a similar analysis of eight nearby X-ray and optically bright elliptical galaxies, Werner et al. found that NGC 4261 exhibited unusually low central gas entropy compared to the full sample. In the central 0.3 kpc of NGC 4261, the ratio of cooling time to freefall time (t(cool)/t(ff)) is less than 10, indicating that cold clouds may be precipitating out of the hot ambient medium and providing fuel for accretion in the central region. NGC 4261 also hosts the most powerful radio source in the original sample. Because NGC 4261 may represent an important phase during which powerful feedback from a central active galactic nucleus (AGN) is fueled by multiphase condensation in the central kiloparsec, we searched the Chandra archive for analogs to NGC 4261. We present entropy profiles of those galaxies, as well as profiles oft(cool)/t(ff). We find that one of them, IC 4296, exhibits properties similar to NGC 4261, including the presence of only single-phase gas outside ofr similar to 2 kpc and a similar central velocity dispersion. We compare the properties of NGC 4261 and IC 4296 to hydrodynamic simulations of AGN feedback fueled by precipitation. Over the course of those simulations, the single-phase galaxy has an entropy gradient that remains similar to the entropy profiles inferred from our observations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

—

Svazek periodika

899

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

1-10

Kód UT WoS článku

000565748200001

EID výsledku v databázi Scopus

2-s2.0-85090421256