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Chandra Observations of the Spectacular A3411–12 Merger Event

Andrade-Santos, Felipe and van Weeren, Reinout J. and Di Gennaro, Gabriella and Wittman, David and Ryu, Dongsu and Lal, Dharam Vir and Placco, Vinicius M. and Fogarty, Kevin and Jee, M. James and Stroe, Andra and Sobral, David and Forman, William R. and Jones, Christine and Kraft, Ralph P. and Murray, Stephen S. and Brüggen, Marcus and Kang, Hyesung and Santucci, Rafael and Golovich, Nathan and Dawson, William (2019) Chandra Observations of the Spectacular A3411–12 Merger Event. Astrophysical Journal, 887 (1). Art. No. 31. ISSN 1538-4357. doi:10.3847/1538-4357/ab4ce5.

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We present deep Chandra observations of A3411–12, a remarkable merging cluster that hosts the most compelling evidence for electron reacceleration at cluster shocks to date. Using the Y_X−M scaling relation, we find r₅₀₀ ~ 1.3 Mpc, M₅₀₀ = (7.1±0.7)×10¹⁴ M_⊙, kT = 6.5±0.1 keV, and a gas mass of M_g,₅₀₀ = (9.7±0.1)×10¹³ M_⊙. The gas mass fraction within r₅₀₀ is f_g = 0.14±0.01. We compute the shock strength using density jumps to conclude that the Mach number of the merging subcluster is small (M⩽1.15+^(0.14)_(−0.09)). We also present density, temperature, pseudo-pressure, and pseudo-entropy maps. Based on the pseudo-entropy map, we conclude that the cluster is undergoing a mild merger, consistent with the small Mach number. On the other hand, radio relics extend over Mpc scale in the A3411–12 system, which strongly suggests that a population of energetic electrons already existed over extended regions of the cluster.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Andrade-Santos, Felipe0000-0002-8144-9285
van Weeren, Reinout J.0000-0002-0587-1660
Di Gennaro, Gabriella0000-0002-8648-8507
Wittman, David0000-0002-0813-5888
Ryu, Dongsu0000-0002-5455-2957
Lal, Dharam Vir0000-0001-5470-305X
Placco, Vinicius M.0000-0003-4479-1265
Fogarty, Kevin0000-0002-2691-2476
Sobral, David0000-0001-8823-4845
Forman, William R.0000-0002-9478-1682
Kraft, Ralph P.0000-0002-0765-0511
Kang, Hyesung0000-0002-4674-5687
Santucci, Rafael0000-0002-7529-1442
Golovich, Nathan0000-0003-2632-572X
Dawson, William0000-0003-0248-6123
Additional Information:© 2019 The American Astronomical Society. Received 2019 May 31; revised 2019 October 8; accepted 2019 October 9; published 2019 December 6. We thank Joseph DePasquale for creating the spectacular image displayed in Figure 1. F.A.-S. acknowledges support from Chandra grant G05-16133X. R.J.vW. acknowledges support from the VIDI research programme with project number 639.042.729, which is financed by the Netherlands Organisation for Scientific Research (NWO). G.D.G. acknowledges support from the ERC Advanced Investigator programme NewClusters 321271. W.R.F., and C.J. are supported by the Smithsonian Institution. C.J. acknowledges support from Chandra grant G016619003. M.J.J. acknowledges support for the current research from the National Research Foundation of Korea under the programs 2017R1A2B2004644 and 2017R1A4A1015178. D.R. and H.K. acknowledge support for the current research from the National Research Foundation of Korea under the programs 2016R1A5A1013277 and 2017R1A2A1A05071429. V.M.P. acknowledges partial support for this work from grant PHY 1430152; Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE), awarded by the US National Science Foundation (NSF). A.S. acknowledges support from the Clay Fellowship. Part of this was work performed under the auspices of the U.S. DOE by LLNL under Contract DE-AC52-07NA27344.
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)639.042.729
European Research Council (ERC)321271
Smithsonian InstitutionUNSPECIFIED
National Research Foundation of Korea2017R1A2B2004644
National Research Foundation of Korea2017R1A4A1015178
National Research Foundation of Korea2016R1A5A1013277
National Research Foundation of Korea2017R1A2A1A05071429
Smithsonian Astrophysical ObservatoryUNSPECIFIED
Department of Energy (DOE)DE-AC52-07NA27344
Subject Keywords:galaxies: clusters: general – galaxies: clusters: individual (A3411) – galaxies: clusters: intracluster mediu
Issue or Number:1
Record Number:CaltechAUTHORS:20200123-092045785
Persistent URL:
Official Citation:Felipe Andrade-Santos et al 2019 ApJ 887 31
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100867
Deposited By: Tony Diaz
Deposited On:23 Jan 2020 18:15
Last Modified:16 Nov 2021 17:57

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