Chandra Observations of the Spectacular A3411-12 Merger Event

Felipe Andrade-Santos; Reinout J. Van Weeren; Gabriella Di Gennaro; David Wittman; Dongsu Ryu; Dharam Vir Lal; Vinicius M. Placco; Kevin Fogarty; M. James Jee; Andra Stroe; David Sobral; William R. Forman; Christine Jones; Ralph P. Kraft; Stephen S. Murray; Marcus Brüggen; Hyesung Kang; Rafael Santucci; Nathan Golovich; William Dawson

doi:10.3847/1538-4357/ab4ce5

Chandra Observations of the Spectacular A3411-12 Merger Event

Felipe Andrade-Santos, Reinout J. Van Weeren, Gabriella Di Gennaro, David Wittman, Dongsu Ryu, Dharam Vir Lal, Vinicius M. Placco, Kevin Fogarty, M. James Jee, Andra Stroe, David Sobral, William R. Forman, Christine Jones, Ralph P. Kraft, Stephen S. Murray, Marcus Brüggen, Hyesung Kang, Rafael Santucci, Nathan Golovich, William Dawson

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Abstract

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 r ₅₀₀ ∼ 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 r ₅₀₀ 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_-0.09 ^+0.14). 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.

Original language	English
Article number	31
Journal	Astrophysical Journal
Volume	887
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ab4ce5
Publication status	Published - 2019 Dec 10

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© 2019. The American Astronomical Society. All rights reserved..

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/ab4ce5

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Andrade-Santos, F., Van Weeren, R. J., Di Gennaro, G., Wittman, D., Ryu, D., Lal, D. V., Placco, V. M., Fogarty, K., Jee, M. J., Stroe, A., Sobral, D., Forman, W. R., Jones, C., Kraft, R. P., Murray, S. S., Brüggen, M., Kang, H., Santucci, R., Golovich, N., & Dawson, W. (2019). Chandra Observations of the Spectacular A3411-12 Merger Event. Astrophysical Journal, 887(1), Article 31. https://doi.org/10.3847/1538-4357/ab4ce5

@article{7e5f73f2cd4c47af9eb2f6a80d907780,

title = "Chandra Observations of the Spectacular A3411-12 Merger Event",

abstract = "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 YX-M scaling relation, we find r 500 ∼ 1.3 Mpc, M500 =(7.1 ± 0.7) × 1014 M⊙, kT =6.5 ± 0.1 keV, and a gas mass of Mg,500 =(9.7 ± 0.1) × 1013 M⊙. The gas mass fraction within r 500 is fg = 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 ≤ 1.15-0.09 +0.14). 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.",

author = "Felipe Andrade-Santos and {Van Weeren}, {Reinout J.} and {Di Gennaro}, Gabriella and David Wittman and Dongsu Ryu and Lal, {Dharam Vir} and Placco, {Vinicius M.} and Kevin Fogarty and Jee, {M. James} and Andra Stroe and David Sobral and Forman, {William R.} and Christine Jones and Kraft, {Ralph P.} and Murray, {Stephen S.} and Marcus Br{\"u}ggen and Hyesung Kang and Rafael Santucci and Nathan Golovich and William Dawson",

year = "2019",

month = dec,

day = "10",

doi = "10.3847/1538-4357/ab4ce5",

language = "English",

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Andrade-Santos, F, Van Weeren, RJ, Di Gennaro, G, Wittman, D, Ryu, D, Lal, DV, Placco, VM, Fogarty, K, Jee, MJ, Stroe, A, Sobral, D, Forman, WR, Jones, C, Kraft, RP, Murray, SS, Brüggen, M, Kang, H, Santucci, R, Golovich, N & Dawson, W 2019, 'Chandra Observations of the Spectacular A3411-12 Merger Event', Astrophysical Journal, vol. 887, no. 1, 31. https://doi.org/10.3847/1538-4357/ab4ce5

TY - JOUR

T1 - Chandra Observations of the Spectacular A3411-12 Merger Event

AU - Andrade-Santos, Felipe

AU - Van Weeren, Reinout J.

AU - Di Gennaro, Gabriella

AU - Wittman, David

AU - Ryu, Dongsu

AU - Lal, Dharam Vir

AU - Placco, Vinicius M.

AU - Fogarty, Kevin

AU - Jee, M. James

AU - Stroe, Andra

AU - Sobral, David

AU - Forman, William R.

AU - Jones, Christine

AU - Kraft, Ralph P.

AU - Murray, Stephen S.

AU - Brüggen, Marcus

AU - Kang, Hyesung

AU - Santucci, Rafael

AU - Golovich, Nathan

AU - Dawson, William

PY - 2019/12/10

Y1 - 2019/12/10

N2 - 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 YX-M scaling relation, we find r 500 ∼ 1.3 Mpc, M500 =(7.1 ± 0.7) × 1014 M⊙, kT =6.5 ± 0.1 keV, and a gas mass of Mg,500 =(9.7 ± 0.1) × 1013 M⊙. The gas mass fraction within r 500 is fg = 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 ≤ 1.15-0.09 +0.14). 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.

AB - 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 YX-M scaling relation, we find r 500 ∼ 1.3 Mpc, M500 =(7.1 ± 0.7) × 1014 M⊙, kT =6.5 ± 0.1 keV, and a gas mass of Mg,500 =(9.7 ± 0.1) × 1013 M⊙. The gas mass fraction within r 500 is fg = 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 ≤ 1.15-0.09 +0.14). 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.

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U2 - 10.3847/1538-4357/ab4ce5

DO - 10.3847/1538-4357/ab4ce5

M3 - Article

AN - SCOPUS:85077305585

SN - 0004-637X

VL - 887

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 31

ER -

Chandra Observations of the Spectacular A3411-12 Merger Event

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