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

J 2019

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

LAKHCHAURA, K., F. MERNIER and Norbert WERNER

Basic information

Original name

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

Authors

LAKHCHAURA, K. (356 India), F. MERNIER (56 Belgium) and Norbert WERNER (703 Slovakia, guarantor, belonging to the institution)

Edition

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2019, 0004-6361

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL Full Text

Impact factor

Impact factor: 5.636

RIV identification code

RIV/00216224:14310/19:00109245

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1051/0004-6361/201834755

UT WoS

000459752000002

Keywords in English

galaxies: abundances; galaxies: evolution; galaxies: active; X-rays: galaxies: clusters

Abstract

V originále

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 (>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.

Citovat

LAKHCHAURA, K., F. MERNIER and Norbert WERNER. Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2019, vol. 623, No 17, p. 1-11. ISSN 0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/201834755.

@article{1504140,
   author = {Lakhchaura, K. and Mernier, F. and Werner, Norbert},
   article_location = {LES ULIS CEDEX A},
   article_number = {17},
   doi = {http://dx.doi.org/10.1051/0004-6361/201834755},
   keywords = {galaxies: abundances; galaxies: evolution; galaxies: active; X-rays: galaxies: clusters},
   language = {eng},
   issn = {0004-6361},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies},
   url = {https://arxiv.org/pdf/1812.00121.pdf},
   volume = {623},
   year = {2019}
}

TY  - JOUR
ID  - 1504140
AU  - Lakhchaura, K. - Mernier, F. - Werner, Norbert
PY  - 2019
TI  - Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 623
IS  - 17
SP  - 1-11
EP  - 1-11
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - galaxies: abundances
KW  - galaxies: evolution
KW  - galaxies: active
KW  - X-rays: galaxies: clusters
UR  - https://arxiv.org/pdf/1812.00121.pdf
N2  - 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 (>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.
ER  -

LAKHCHAURA, K., F. MERNIER and Norbert WERNER. Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies. \textit{ASTRONOMY \&{} ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2019, vol.~623, No~17, p.~1-11. ISSN~0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/201834755.

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