A NuSTAR observation of the center of the Coma Cluster

Understand

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 $5.1 \times 10^{-12}$ erg cm$^{-2}$ s$^{-1}$ in a 12 arcmin $\times$ 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.