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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

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

Name of the periodical

ASTRONOMY & ASTROPHYSICS

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

623

Issue of the periodical within the volume

17

Country of publishing house

FR - FRANCE

Number of pages

11

Pages from-to

1-11

UT code for WoS article

000459752000002

EID of the result in the Scopus database

2-s2.0-85062795396