Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00109245" target="_blank" >RIV/00216224:14310/19:00109245 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.aanda.org/articles/aa/abs/2019/03/aa34755-18/aa34755-18.html" target="_blank" >https://www.aanda.org/articles/aa/abs/2019/03/aa34755-18/aa34755-18.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201834755" target="_blank" >10.1051/0004-6361/201834755</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies

Popis výsledku v původním jazyce

We present azimuthally averaged metal abundance profiles from a full, comprehensive, and conservative re-analysis of the deep (similar to 800 ks total net exposure) Chandra/ACIS-S observation of the Centaurus cluster core (NGC 4696). After carefully checking various sources of systematic uncertainties, including the choice of the spectral deprojection method, assumptions about the temperature structure of the gas, and uncertainties in the continuum modeling, we confirm the existence of a central drop in the abundances of the "reactive" elements Fe, Si, S, Mg, and Ca, within r less than or similar to 10 kpc. The same drops are also found when analyzing the XMM-Newton/EPIC data (similar to 150 ks). Adopting our most conservative approach, we find that, unlike the central drops seen for Fe, Si, S, Mg and Ca, the abundance of the "nonreactive" element Ar is fully consistent with showing no central drop. This is further confirmed by the significant (&gt;3 sigma) central radial increase of the Ar/Fe ratio. Our results corroborate the previously proposed "dust depletion scenario", in which central metal abundance drops are explained by the deposition of a significant fraction of centrally cooled reactive metals into dust grains present in the central regions of the Centaurus cluster. This is also supported by the previous findings that the extent of the metal abundance drops in NGC4696 broadly coincides with the infrared dust emission.

Název v anglickém jazyce

Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies

Popis výsledku anglicky

We present azimuthally averaged metal abundance profiles from a full, comprehensive, and conservative re-analysis of the deep (similar to 800 ks total net exposure) Chandra/ACIS-S observation of the Centaurus cluster core (NGC 4696). After carefully checking various sources of systematic uncertainties, including the choice of the spectral deprojection method, assumptions about the temperature structure of the gas, and uncertainties in the continuum modeling, we confirm the existence of a central drop in the abundances of the "reactive" elements Fe, Si, S, Mg, and Ca, within r less than or similar to 10 kpc. The same drops are also found when analyzing the XMM-Newton/EPIC data (similar to 150 ks). Adopting our most conservative approach, we find that, unlike the central drops seen for Fe, Si, S, Mg and Ca, the abundance of the "nonreactive" element Ar is fully consistent with showing no central drop. This is further confirmed by the significant (&gt;3 sigma) central radial increase of the Ar/Fe ratio. Our results corroborate the previously proposed "dust depletion scenario", in which central metal abundance drops are explained by the deposition of a significant fraction of centrally cooled reactive metals into dust grains present in the central regions of the Centaurus cluster. This is also supported by the previous findings that the extent of the metal abundance drops in NGC4696 broadly coincides with the infrared dust emission.

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<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

ASTRONOMY & ASTROPHYSICS

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

623

Číslo periodika v rámci svazku

17

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

11

Strana od-do

1-11

Kód UT WoS článku

000459752000002

EID výsledku v databázi Scopus

2-s2.0-85062795396