Akamatsu, H.

De Plaa, J.

Gaspari, M.

Hoang, D.N.

Kraft, R.

Mernier, F.

Rojas Bolivar, R.

Rudnick, L.

Simionescu, A.

Stuardi, C.

Tumer, A.

Weeren, R.J. van

Wik, D.R.

Zhang, X.

Leiden University Scholary Publications

A NuSTAR and Chandra study of late stage galaxy cluster merger CL0217+70 and its tell-tale radio haloTumer, A.; Wik, D.R.; Zhang, X.; Simionescu, A.; Gaspari, M.; Rojas Bolivar, R.; ... ; Kraft, R.CitationTumer, A., Wik, D. R., Zhang, X., Simionescu, A., Gaspari, M., Rojas Bolivar, R., … Kraft, R.(2022). A NuSTAR and Chandra study of late stage galaxy cluster merger CL 0217+70 and itstell-tale radio halo. Bulletin Of The American Astronomical Society, (3), 107.24. Retrievedfrom https://hdl.handle.net/1887/3561560 Version: Publisher's VersionLicense: Creative Commons CC BY 4.0 licenseDownloaded from: https://hdl.handle.net/1887/3561560 Note: To cite this publication please use the final published version (if applicable).Bulletin of the AAS • Vol. 54, Issue 3 (HEAD19 Abstracts)A NuSTAR and ChandraStudy of Late Stage GalaxyCluster Merger CL 0217+70and Its Tell-Tale Radio HaloAysegul Tumer1, Daniel R. Wik1, Xiaoyuan Zhang2,Aurora Simionescu3, Massimo Gaspari4, Randall Rojas Bolivar1,Reinout J. van Wereen2, Hiroki Akamatsu3, Duy N. Hoang5,Lawrence Rudnick6, Chiara Stuardi7, Francois Mernier8, Jelle De Plaa3,Ralph Kraft91University of Utah, 2Leiden Observatory, Leiden University,3SRON Netherlands Institute for Space Research,4INAF, Osservatorio di Astro sica e Scienza dello Spazio,5Hamburger Sternwarte, University of Hamburg,6Minnesota Institute for Astrophysics, University of Minnesota,7Dipartimento di Fisica e Astronomia, Università di Bologna, 8European Space Agency (ESA),9Center for Astrophysics | Harvard & SmithsonianPublished on: Apr 01, 2022License: Creative Commons Attribution 4.0 International License (CC-BY 4.0)Bulletin of the AAS • Vol. 54, Issue 3 (HEAD19 Abstracts)A NuSTAR and Chandra Study of Late Stage Galaxy Cluster Merger CL 0217+70 and Its Tell-Tale Radio Halo2Mergers of galaxy clusters are the most energetic events in the Universe since the Big Bang. They drive shock and cold fronts, generating turbulence into the intracluster medium (ICM), while also (re)accelerating electrons and cosmic rays through Fermi-like acceleration processes that create radio halos and relics. How and when radio halos are generated in a merger and their X-ray signatures are poorly understood. Galaxy cluster CL 0217+70 is a remarkable, late-stage merger, with two extended radio relics and a well-studied radio halo (Hoang et al. 2021). A recent Chandra study (Zhang et al. 2020) reveals surface brightness edges in the ICM that correspond to features in the halo, making the cluster one of very few systems where surface brightness edges are associated with the halo edge. Upon this discovery, we studied the cluster in detail with our deep (180 ks) NuSTAR observation. In this talk, I will present our findings on the nature of these edges as well as the discovery of a hot spot (~13 keV), which is even hotter than the center of the cluster and discuss its origin and implications on the merger history. In addition, I will discuss our results on the inverse Compton emission search associated with the radio halo.

A NuSTAR and Chandra study of late stage galaxy cluster merger CL 0217+70 and its tell-tale radio halo

A NuSTAR and Chandra study of late stage galaxy cluster merger CL 0217+70 and its tell-tale radio halo

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Leiden University Scholary Publications