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MC<sup>2</sup>: Boosted AGN and star formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z = 0.19

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MC<sup>2</sup> Boosted AGN and star formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z = 0.19. / Sobral, David; Stroe, Andra; Dawson, William A.; Wittman, David; James Jee, M.; Röttgering, Huub; van Weeren, Reinout J.; Brüggen, Marcus.

In: Monthly Notices of the Royal Astronomical Society, Vol. 450, No. 1, 11.06.2015, p. 630-645.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Sobral, D, Stroe, A, Dawson, WA, Wittman, D, James Jee, M, Röttgering, H, van Weeren, RJ & Brüggen, M 2015, 'MC<sup>2</sup> Boosted AGN and star formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z = 0.19', Monthly Notices of the Royal Astronomical Society, vol. 450, no. 1, pp. 630-645. https://doi.org/10.1093/mnras/stv521

APA

Sobral, D., Stroe, A., Dawson, W. A., Wittman, D., James Jee, M., Röttgering, H., van Weeren, R. J., & Brüggen, M. (2015). MC<sup>2</sup> Boosted AGN and star formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z = 0.19. Monthly Notices of the Royal Astronomical Society, 450(1), 630-645. https://doi.org/10.1093/mnras/stv521

Vancouver

Sobral D, Stroe A, Dawson WA, Wittman D, James Jee M, Röttgering H et al. MC<sup>2</sup> Boosted AGN and star formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z = 0.19. Monthly Notices of the Royal Astronomical Society. 2015 Jun 11;450(1):630-645. https://doi.org/10.1093/mnras/stv521

Author

Sobral, David ; Stroe, Andra ; Dawson, William A. ; Wittman, David ; James Jee, M. ; Röttgering, Huub ; van Weeren, Reinout J. ; Brüggen, Marcus. / MC<sup>2</sup> Boosted AGN and star formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z = 0.19. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 450, No. 1. pp. 630-645.

Bibtex

@article{fda46b48171642659b219508b91d72cf,
title = "MC2: Boosted AGN and star formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z = 0.19",
abstract = "Cluster mergers may play a fundamental role in the formation and evolution of cluster galaxies. Stroe et al. revealed unexpected overdensities of candidate Hα emitters near the ~1-Mpc-wide shock fronts of the massive (~2 × 1015 M⊙) 'Sausage' merging cluster, CIZA J2242.8+5301. We used the Keck/Deep Imaging Multi-Object Spectrograph and the William Herschel Telescope/AutoFib2+WYFFOS to confirm 83 Hα emitters in and around the merging cluster. We find that cluster star-forming galaxies in the hottest X-ray gas and/or in the cluster subcores (away from the shock fronts) show high [S II]6716/[S II]6761 and high [S II] 6716/Hα, implying very low electron densities (<30 × lower than all other star-forming galaxies outside the cluster) and/or significant contribution from supernovae, respectively. All cluster star-forming galaxies near the cluster centre show evidence of significant outflows (blueshifted Na D ~200-300 km s-1), likely driven by supernovae. Strong outflows are also found for the cluster Hα active galactic nucleus (AGN). Hα star-forming galaxies in the merging cluster follow the z ~ 0 mass-metallicity relation, showing systematically higher metallicity (~0.15-0.2 dex) than Hα emitters outside the cluster (projected R > 2.5 Mpc). This suggests that the shock front may have triggered remaining metal-rich gas which galaxies were able to retain into forming stars. Our observations show that the merger of impressively massive (~1015 M⊙) clusters can provide the conditions for significant star formation and AGN activity, but, as we witness strong feedback by star-forming galaxies and AGN (and given how massive the merging cluster is), such sources will likely quench in a few 100 Myr.",
keywords = "Cosmology: observations, galaxies: clusters: general, Galaxies: clusters: individual: CIZA J2242.8+5301, Galaxies: evolution, Intergalactic medium, Large-scale structure of Universe",
author = "David Sobral and Andra Stroe and Dawson, {William A.} and David Wittman and {James Jee}, M. and Huub R{\"o}ttgering and {van Weeren}, {Reinout J.} and Marcus Br{\"u}ggen",
year = "2015",
month = jun,
day = "11",
doi = "10.1093/mnras/stv521",
language = "English",
volume = "450",
pages = "630--645",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "1",

}

RIS

TY - JOUR

T1 - MC2

T2 - Boosted AGN and star formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z = 0.19

AU - Sobral, David

AU - Stroe, Andra

AU - Dawson, William A.

AU - Wittman, David

AU - James Jee, M.

AU - Röttgering, Huub

AU - van Weeren, Reinout J.

AU - Brüggen, Marcus

PY - 2015/6/11

Y1 - 2015/6/11

N2 - Cluster mergers may play a fundamental role in the formation and evolution of cluster galaxies. Stroe et al. revealed unexpected overdensities of candidate Hα emitters near the ~1-Mpc-wide shock fronts of the massive (~2 × 1015 M⊙) 'Sausage' merging cluster, CIZA J2242.8+5301. We used the Keck/Deep Imaging Multi-Object Spectrograph and the William Herschel Telescope/AutoFib2+WYFFOS to confirm 83 Hα emitters in and around the merging cluster. We find that cluster star-forming galaxies in the hottest X-ray gas and/or in the cluster subcores (away from the shock fronts) show high [S II]6716/[S II]6761 and high [S II] 6716/Hα, implying very low electron densities (<30 × lower than all other star-forming galaxies outside the cluster) and/or significant contribution from supernovae, respectively. All cluster star-forming galaxies near the cluster centre show evidence of significant outflows (blueshifted Na D ~200-300 km s-1), likely driven by supernovae. Strong outflows are also found for the cluster Hα active galactic nucleus (AGN). Hα star-forming galaxies in the merging cluster follow the z ~ 0 mass-metallicity relation, showing systematically higher metallicity (~0.15-0.2 dex) than Hα emitters outside the cluster (projected R > 2.5 Mpc). This suggests that the shock front may have triggered remaining metal-rich gas which galaxies were able to retain into forming stars. Our observations show that the merger of impressively massive (~1015 M⊙) clusters can provide the conditions for significant star formation and AGN activity, but, as we witness strong feedback by star-forming galaxies and AGN (and given how massive the merging cluster is), such sources will likely quench in a few 100 Myr.

AB - Cluster mergers may play a fundamental role in the formation and evolution of cluster galaxies. Stroe et al. revealed unexpected overdensities of candidate Hα emitters near the ~1-Mpc-wide shock fronts of the massive (~2 × 1015 M⊙) 'Sausage' merging cluster, CIZA J2242.8+5301. We used the Keck/Deep Imaging Multi-Object Spectrograph and the William Herschel Telescope/AutoFib2+WYFFOS to confirm 83 Hα emitters in and around the merging cluster. We find that cluster star-forming galaxies in the hottest X-ray gas and/or in the cluster subcores (away from the shock fronts) show high [S II]6716/[S II]6761 and high [S II] 6716/Hα, implying very low electron densities (<30 × lower than all other star-forming galaxies outside the cluster) and/or significant contribution from supernovae, respectively. All cluster star-forming galaxies near the cluster centre show evidence of significant outflows (blueshifted Na D ~200-300 km s-1), likely driven by supernovae. Strong outflows are also found for the cluster Hα active galactic nucleus (AGN). Hα star-forming galaxies in the merging cluster follow the z ~ 0 mass-metallicity relation, showing systematically higher metallicity (~0.15-0.2 dex) than Hα emitters outside the cluster (projected R > 2.5 Mpc). This suggests that the shock front may have triggered remaining metal-rich gas which galaxies were able to retain into forming stars. Our observations show that the merger of impressively massive (~1015 M⊙) clusters can provide the conditions for significant star formation and AGN activity, but, as we witness strong feedback by star-forming galaxies and AGN (and given how massive the merging cluster is), such sources will likely quench in a few 100 Myr.

KW - Cosmology: observations

KW - galaxies: clusters: general

KW - Galaxies: clusters: individual: CIZA J2242.8+5301

KW - Galaxies: evolution

KW - Intergalactic medium

KW - Large-scale structure of Universe

U2 - 10.1093/mnras/stv521

DO - 10.1093/mnras/stv521

M3 - Journal article

VL - 450

SP - 630

EP - 645

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -