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A NuSTAR observation of the center of the Coma Cluster

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arxiv 1411.1573 v2 pith:F2GU72GS submitted 2014-11-06 astro-ph.HE astro-ph.CO

F. Gastaldello , D. R. Wik , S. Molendi , N. J. Westergaard , A. Hornstrup , G. Madejski , D. D. M. Ferreira , S. E. Boggs
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F. E. Christensen W. W. Craig B. W. Grefenstette C. J. Hailey F. A. Harrison K. K. Madsen D. Stern W. W. Zhang
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classification astro-ph.HEastro-ph.CO
keywords nustarcomatemperaturearcminclustercomponentemissionobservation
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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.

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  1. NuSTAR Observations of the Galaxy Cluster Abell 3667

    astro-ph.HE 2025-05 conditional novelty 4.0 of 10

    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.

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