Observations of a pre-merger shock in colliding clusters of galaxies

Liyi Gu, Hiroki Akamatsu, Timothy W. Shimwell, Huib T. Intema, Reinout J. van Weeren, Francesco de Gasperin, Francois Mernier, Junjie Mao, Igone Urdampilleta, Jelle de Plaa, Viral Parekh, Huub J. A. Röttgering, Jelle S. Kaastra

Research output: Contribution to journalArticle

Abstract

Clusters of galaxies are the largest known gravitationally bound structures in the Universe. When clusters collide, they create merger shocks on cosmological scales, which transform most of the kinetic energy carried by the cluster gaseous halos into heat 1–3. Observations of merger shocks provide key information on the merger dynamics, and enable insights into the formation and thermal history of the large-scale structures. Nearly all of the merger shocks are found in systems where the clusters have already collided 4–12; knowledge of shocks in the pre-merger phase is a crucial missing ingredient 13,14. Here, we report on the discovery of a unique shock in a cluster pair 1E 2216.0-0401 and 1E 2215.7-0404. The two clusters are observed at an early phase of major merger. Contrary to all the known merger shocks observed ubiquitously on merger axes, the new shock propagates outward along the equatorial plane of the merger. This discovery uncovers an important epoch in the formation of massive clusters, when the rapid approach of the cluster pair leads to strong compression of gas along the merger axis. Current theoretical models 15,16 predict that the bulk of the shock energy might be dissipated outside the clusters, and eventually turn into heat of the pristine gas in the circum-cluster space.

Original languageEnglish
Pages (from-to)838-843
Number of pages6
JournalNature Astronomy
Volume3
Issue number9
DOIs
Publication statusPublished - 24 Jun 2019

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shock
galaxies
heat
gases
ingredients
halos
universe
kinetic energy
time measurement
histories

Keywords

  • astrophyics
  • galaxies
  • star clusters
  • high energy astrophysics

Cite this

Gu, L., Akamatsu, H., Shimwell, T. W., Intema, H. T., Weeren, R. J. V., Gasperin, F. D., ... Kaastra, J. S. (2019). Observations of a pre-merger shock in colliding clusters of galaxies. Nature Astronomy, 3(9), 838-843. https://doi.org/10.1038/s41550-019-0798-8
Gu, Liyi ; Akamatsu, Hiroki ; Shimwell, Timothy W. ; Intema, Huib T. ; Weeren, Reinout J. van ; Gasperin, Francesco de ; Mernier, Francois ; Mao, Junjie ; Urdampilleta, Igone ; Plaa, Jelle de ; Parekh, Viral ; Röttgering, Huub J. A. ; Kaastra, Jelle S. / Observations of a pre-merger shock in colliding clusters of galaxies. In: Nature Astronomy. 2019 ; Vol. 3, No. 9. pp. 838-843.
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Gu, L, Akamatsu, H, Shimwell, TW, Intema, HT, Weeren, RJV, Gasperin, FD, Mernier, F, Mao, J, Urdampilleta, I, Plaa, JD, Parekh, V, Röttgering, HJA & Kaastra, JS 2019, 'Observations of a pre-merger shock in colliding clusters of galaxies', Nature Astronomy, vol. 3, no. 9, pp. 838-843. https://doi.org/10.1038/s41550-019-0798-8

Observations of a pre-merger shock in colliding clusters of galaxies. / Gu, Liyi; Akamatsu, Hiroki; Shimwell, Timothy W.; Intema, Huib T.; Weeren, Reinout J. van; Gasperin, Francesco de; Mernier, Francois; Mao, Junjie; Urdampilleta, Igone; Plaa, Jelle de; Parekh, Viral; Röttgering, Huub J. A.; Kaastra, Jelle S.

In: Nature Astronomy, Vol. 3, No. 9, 24.06.2019, p. 838-843.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Observations of a pre-merger shock in colliding clusters of galaxies

AU - Gu, Liyi

AU - Akamatsu, Hiroki

AU - Shimwell, Timothy W.

AU - Intema, Huib T.

AU - Weeren, Reinout J. van

AU - Gasperin, Francesco de

AU - Mernier, Francois

AU - Mao, Junjie

AU - Urdampilleta, Igone

AU - Plaa, Jelle de

AU - Parekh, Viral

AU - Röttgering, Huub J. A.

AU - Kaastra, Jelle S.

PY - 2019/6/24

Y1 - 2019/6/24

N2 - Clusters of galaxies are the largest known gravitationally bound structures in the Universe. When clusters collide, they create merger shocks on cosmological scales, which transform most of the kinetic energy carried by the cluster gaseous halos into heat 1–3. Observations of merger shocks provide key information on the merger dynamics, and enable insights into the formation and thermal history of the large-scale structures. Nearly all of the merger shocks are found in systems where the clusters have already collided 4–12; knowledge of shocks in the pre-merger phase is a crucial missing ingredient 13,14. Here, we report on the discovery of a unique shock in a cluster pair 1E 2216.0-0401 and 1E 2215.7-0404. The two clusters are observed at an early phase of major merger. Contrary to all the known merger shocks observed ubiquitously on merger axes, the new shock propagates outward along the equatorial plane of the merger. This discovery uncovers an important epoch in the formation of massive clusters, when the rapid approach of the cluster pair leads to strong compression of gas along the merger axis. Current theoretical models 15,16 predict that the bulk of the shock energy might be dissipated outside the clusters, and eventually turn into heat of the pristine gas in the circum-cluster space.

AB - Clusters of galaxies are the largest known gravitationally bound structures in the Universe. When clusters collide, they create merger shocks on cosmological scales, which transform most of the kinetic energy carried by the cluster gaseous halos into heat 1–3. Observations of merger shocks provide key information on the merger dynamics, and enable insights into the formation and thermal history of the large-scale structures. Nearly all of the merger shocks are found in systems where the clusters have already collided 4–12; knowledge of shocks in the pre-merger phase is a crucial missing ingredient 13,14. Here, we report on the discovery of a unique shock in a cluster pair 1E 2216.0-0401 and 1E 2215.7-0404. The two clusters are observed at an early phase of major merger. Contrary to all the known merger shocks observed ubiquitously on merger axes, the new shock propagates outward along the equatorial plane of the merger. This discovery uncovers an important epoch in the formation of massive clusters, when the rapid approach of the cluster pair leads to strong compression of gas along the merger axis. Current theoretical models 15,16 predict that the bulk of the shock energy might be dissipated outside the clusters, and eventually turn into heat of the pristine gas in the circum-cluster space.

KW - astrophyics

KW - galaxies

KW - star clusters

KW - high energy astrophysics

U2 - 10.1038/s41550-019-0798-8

DO - 10.1038/s41550-019-0798-8

M3 - Article

VL - 3

SP - 838

EP - 843

IS - 9

ER -

Gu L, Akamatsu H, Shimwell TW, Intema HT, Weeren RJV, Gasperin FD et al. Observations of a pre-merger shock in colliding clusters of galaxies. Nature Astronomy. 2019 Jun 24;3(9):838-843. https://doi.org/10.1038/s41550-019-0798-8