| Autor: |
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 |
| Předmět: |
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| Zdroj: |
Astrophysical Journal; 12/10/2019, Vol. 887 Issue 1, p1-1, 1p |
| Abstrakt: |
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 scaling relation, we find r500 ∼ 1.3 Mpc, , , and a gas mass of . The gas mass fraction within r500 is . We compute the shock strength using density jumps to conclude that the Mach number of the merging subcluster is small (). 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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