Deep NuSTAR spectra of Abell 3667's core favor a two-temperature thermal model over an inverse Compton power law for the hard X-ray excess, with a ~0.2 uG magnetic field lower limit.
Hard X-Ray Radiation in the Coma Cluster Spectrum
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abstract
Hard X-ray radiation has been detected for the first time in the Coma cluster by BeppoSAX. Thanks to the unprecedented sensitivity of the Phoswich Detection System (PDS) instrument, the source has been detected up to ~80 keV. There is clear evidence (4.5 sigma) for non-thermal emission in excess of thermal above ~25 keV. The hard excess is very unlikely due to X Comae, the Seyfert 1 galaxy present in the field of view of the PDS. A hard spectral tail due to inverse Compton on CMB photons is predicted in clusters, like Coma, with radio halos. Combining the present results with radio observations, a volume-averaged intracluster magnetic field of ~0.15 micro G is derived, while the electron energy density of the emitting electrons is ~7x10**-14 erg/cm**3.
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NuSTAR Observations of the Galaxy Cluster Abell 3667
Deep NuSTAR spectra of Abell 3667's core favor a two-temperature thermal model over an inverse Compton power law for the hard X-ray excess, with a ~0.2 uG magnetic field lower limit.