C.D.S. - SIMBAD4 rel 1.7 - 2021.01.17CET14:31:21

2019A&A...629A..31U - Astronomy and Astrophysics, volume 629A, 31-31 (2019/9-1)

Iron abundance distribution in the hot gas of merging galaxy clusters.


Abstract (from CDS):

We present XMM-Newton/EPIC observations of six merging galaxy clusters and study the distributions of their temperature, iron (Fe) abundance and pseudo-entropy along the merging axis. For the first time, we focused simultaneously, and in a comprehensive way, on the chemical and thermodynamic properties of the newly collided intra cluster medium (ICM). The Fe distribution of these clusters along the merging axis is found to be in good agreement with the azimuthally-averaged Fe abundance profile in typical non-cool-core clusters out to r500. In addition to showing a moderate central abundance peak, though less pronounced than in relaxed systems, the Fe abundance flattens at large radii towards ∼0.2-0.3Z. Although this shallow metal distribution is in line with the idea that disturbed, non-cool-core clusters originate from the merging of relaxed, cool-core clusters, we find that in some cases, remnants of metal-rich and low entropy cool cores can persist after major mergers. While we obtain a mild anti-correlation between the Fe abundance and the pseudo-entropy in the (lower entropy, K=200-500keV.cm2) inner regions, no clear correlation is found at (higher entropy, K=500-2300keV.cm2) outer radii. The apparent spatial abundance uniformity that we find at large radii is difficult to explain through an efficient mixing of freshly injected metals, particularly in systems for which the time since the merger is short. Instead, our results provide important additional evidence in favour of the early enrichment scenario in which the bulk of the metals are released outside galaxies at z>2-3, and extend it from cool-core and (moderate) non-cool-core clusters to a few of the most disturbed merging clusters as well. These results constitute a first step toward a deeper understanding of the chemical history of merging clusters.

Abstract Copyright: © ESO 2019

Journal keyword(s): X-rays: galaxies: clusters - galaxies: clusters: intracluster medium - galaxies: abundances - shock waves

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 275 0
2 ClG J0603.3+4214 ClG 06 03.3 +42 14           ~ 73 0
3 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 403 0
4 NAME LHB X 16 42.0 +02 19           ~ 271 0
5 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 836 1
6 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 572 1
7 NAME Sausage Cluster ClG 22 42 53.0 +53 01 05           ~ 162 0

    Equat.    Gal    SGal    Ecl

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