A NuSTAR observation of the center of the Coma Cluster

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 $5.1\times 10^{-12}$ 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. 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 and low background in the 3-20 keV band, making NuSTAR an ideal instrument to measure high temperatures in the intracluster medium.

8 pages, 7 figures, accepted for publication in ApJ. Minor changes to match published version

References in corpus (8)

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• NuSTAR Observations of the Bullet Cluster: Constraints on Inverse Compton Emission
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• Possible non-thermal origin of the hard X-ray emission in the merging galaxy cluster SPT-CL J2031-4037
• The NuSTAR, XMM-Newton, and Suzaku view of A3395 at the intercluster filament interface
• Cross Calibration of Galaxy Cluster Temperatures Measured with NuSTAR, XMM-Newton, and Chandra
• Probing the low-energy spectrum of non-thermal electrons in galaxy clusters with soft gamma ray observations