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Related Experiment Videos

Hard X-Ray Emission from the Galaxy Cluster A2256.

Fusco-Femiano, Dal Fiume D, De Grandi S

    The Astrophysical Journal
    |May 2, 2000
    PubMed
    Summary

    We found evidence of nonthermal X-ray emission in the Coma Cluster (A2256), suggesting complex intracluster magnetic fields. This supports models of cosmic ray interactions within galaxy clusters.

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    Area of Science:

    • * Astronomy and Astrophysics
    • * Cosmic Ray Physics
    • * Plasma Physics

    Background:

    • * Galaxy clusters are complex systems containing hot gas and magnetic fields.
    • * Previous observations (ASCA) suggested nonthermal emission in the Coma Cluster (A2256).
    • * BeppoSAX detected hard X-ray radiation up to 80 keV in the Coma Cluster spectrum.

    Purpose of the Study:

    • * To present evidence for nonthermal X-ray emission in the Coma Cluster (A2256).
    • * To investigate the presence of multiple nonthermal components in the cluster's X-ray spectrum.
    • * To constrain the intracluster magnetic field strength.

    Main Methods:

    • * Analysis of X-ray spectral data from the BeppoSAX satellite.
    • * Statistical analysis to confirm nonthermal emission at a 4.6 sigma confidence level.

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  • * Comparison with existing ASCA data and theoretical models (inverse Compton).

    • Main Results:

    • * Confirmed nonthermal emission in A2256 exceeding thermal emission.
    • * Marginal consistency of the hard X-ray tail spectral index with the inverse Compton model.
    • * Estimated intracluster magnetic field strengths of ~0.05 µG (northern regions) and potentially ~0.5 µG (central radio halo).

    Conclusions:

    • * The Coma Cluster (A2256) exhibits significant nonthermal X-ray emission.
    • * The results support the presence of complex intracluster magnetic fields.
    • * The findings are consistent with inverse Compton scattering of cosmic rays by intracluster magnetic fields.