J 2017

The metallicity of the intracluster medium over cosmic time: further evidence for early enrichment

MANTZ, A., S. W. ALLEN, R. G. MORRIS, A. SIMIONESCU, Ondrej URBAN et. al.

Basic information

Original name

The metallicity of the intracluster medium over cosmic time: further evidence for early enrichment

Authors

MANTZ, A. (840 United States of America), S. W. ALLEN (826 United Kingdom of Great Britain and Northern Ireland), R. G. MORRIS (826 United Kingdom of Great Britain and Northern Ireland), A. SIMIONESCU (642 Romania), Ondrej URBAN (703 Slovakia), Norbert WERNER (703 Slovakia, guarantor, belonging to the institution) and I. ZHURAVLEVA (643 Russian Federation)

Edition

Monthly Notices of the Royal Astronomical Society, Oxford, OXFORD UNIV PRESS, 2017, 0035-8711

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 5.194

RIV identification code

RIV/00216224:14310/17:00099807

Organization unit

Faculty of Science

DOI

UT WoS

000413088400032

Keywords in English

galaxies: clusters: intracluster medium; X-rays: galaxies: clusters

Tags

Tags

International impact, Reviewed
Změněno: 10/11/2022 13:09, Mgr. Marie Šípková, DiS.

Abstract

V originále

We use Chandra X-ray data to measure the metallicity of the intracluster medium (ICM) in 245 massive galaxy clusters selected from X-ray and Sunyaev-Zel'dovich (SZ) effect surveys, spanning redshifts 0 < z < 1.2. Metallicities were measured in three different radial ranges, spanning cluster cores through their outskirts. We explore trends in these measurements as a function of cluster redshift, temperature and surface brightness 'peakiness' (a proxy for gas cooling efficiency in cluster centres). The data at large radii (0.5-1 r(500)) are consistent with a constant metallicity, while at intermediate radii (0.1-0.5 r(500)) we see a late-time increase in enrichment, consistent with the expected production and mixing of metals in cluster cores. In cluster centres, there are strong trends of metallicity with temperature and peakiness, reflecting enhanced metal production in the lowest entropy gas. Within the cool-core/sharply peaked cluster population, there is a large intrinsic scatter in central metallicity and no overall evolution, indicating significant astrophysical variations in the efficiency of enrichment. The central metallicity in clusters with flat surface brightness profiles is lower, with a smaller intrinsic scatter, but increases towards lower redshifts. Our results are consistent with other recent measurements of ICM metallicity as a function of redshift. They reinforce the picture implied by observations of uniform metal distributions in the outskirts of nearby clusters, in which most of the enrichment of the ICM takes place before cluster formation, with significant later enrichment taking place only in cluster centres, as the stellar populations of the central galaxies evolve.