SIMBAD references

2006ApJ...649..673R - Astrophys. J., 649, 673-677 (2006/October-1)

Long RXTE observations of A2163.

REPHAELI Y., GRUBER D. and ARIELI Y.

Abstract (from CDS):

A2163 was observed by the RXTE satellite for ∼530 ks during a 6 month period, starting in 2004 August. The cluster primary emission is from very hot intracluster gas with kT∼15 keV, but this component does not by itself provide the best-fitting model. A secondary emission component is quite clearly needed, and while this could also be thermal at a temperature significantly lower than kT∼15 keV, the best fit (to the combined PCA and HEXTE data sets) is obtained with a power-law secondary spectral component. The deduced parameters of the nonthermal (NT) emission imply a significant fractional flux amounting to ∼25% of the integrated 3-50 keV emission. NT emission is expected, given the intense level of radio emission, most prominently from a large extended (``halo'') central region of the cluster. Interpreting the deduced NT emission as Compton scattering of the radio-emitting relativistic electrons by the CMB, we estimate the volume-averaged value of the magnetic field in the extended radio region to be B∼0.4±0.2 µG.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Clusters: Individual: Alphanumeric: A2163 - Galaxies: Magnetic Fields - Radiation Mechanisms: Nonthermal

Simbad objects: 10

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2020.02.20-14:47:05

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