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 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.

Original languageEnglish
Article number31
JournalAstrophysical Journal
Volume887
Issue number1
DOIs
Publication statusPublished - 2019 Dec 10

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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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), [31]. https://doi.org/10.3847/1538-4357/ab4ce5