A NuSTAR observation of the center of the Coma Cluster
F. Gastaldello, D. R. Wik, S. Molendi, N. J. Westergaard, A., Hornstrup, G. Madejski, D. D. M. Ferreira, S. E. Boggs, F. E. Christensen, W., W. Craig, B. W. Grefenstette, C. J. Hailey, F. A. Harrison, K. K. Madsen, D., Stern, W. W. Zhang

TL;DR
This study uses NuSTAR X-ray observations to analyze the thermal and non-thermal emissions in the core of the Coma Cluster, setting upper limits on non-thermal inverse Compton emission and mapping temperature distribution.
Contribution
First NuSTAR observation of the Coma Cluster core providing constraints on non-thermal emission and detailed temperature mapping.
Findings
Thermal emission dominates the spectrum.
Upper limit on non-thermal IC emission is $5.1 imes 10^{-12}$ erg cm$^{-2}$ s$^{-1}$.
Temperature map shows a gradient from hot northwest to cooler southeast.
Abstract
We present the results of a 55ks NuSTAR observation of the core of the Coma Cluster. The global spectrum can be explained by thermal gas emission, with a conservative 90% upper limit to non-thermal inverse Compton (IC) emission of erg cm s in a 12 arcmin 12 arcmin field of view . The brightness of the thermal component in this central region does not allow more stringent upper limits on the IC component when compared with non-imaging instruments with much larger fields of view where claims of detections have been made. Future mosaic NuSTAR observations of Coma will further address this issue. The temperature map shows a relatively uniform temperature distribution with a gradient from the hot northwest side to the cooler southeast, in agreement with previous measurements. The temperature determination is robust given the flat effective area…
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