Nonthermal emission from clusters of galaxies

Details Nonthermal emission from clusters of galaxies Nonthermal emission from clusters of galaxies

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...362..886b&link_type=abstract

Astronomy and Astrophysics, v.362, p.886-894 (2000)

Astronomy and Astrophysics

Astrophysics

19

Acceleration Of Particles, Radiation Mechanisms: Non-Thermal, Galaxies: Clusters: General, Gamma Rays: Theory, Radio Continuum: Galaxies, X-Rays: Galaxies

Scientific paper

We demonstrate that fast moving halos in clusters of galaxies provide a plausible source of (extended) nonthermal X-ray and {gamma -ray} emission. This follows from the fact that accelerated particles are produced in their bow shocks. A substantial fraction of a virialized ensemble of halos can have moderate supersonic velocities outside the central region of a rich cluster. Dark matter halos of supersonic and superalfvenic velocity will create collisionless bow shocks of moderate Mach number M ;raise0 .3exhbox {>kern -0.75emraise -1.1exhbox {\sim}}; 2, due to electromagnetic interaction between comoving baryonic matter and the hot intra-cluster gas. We present kinetic modelling of nonthermal electron injection, acceleration and propagation in such systems and conclude that the halos are efficient electron accelerators and sources of hard X-ray and {gamma -ray} emission. Inverse-Compton radiation, bremsstrahlung, and synchrotron radiation by these electrons produce spectra that are in quantitative agreement with e.g. the hard X-ray and radio emission observed from the Coma cluster. Moreover, the relative increase of hard X-ray emission outside the central 0.3-0.4 Mpc of the cluster A2199, as observed by BeppoSAX, can be understood in this framework. Spatially resolved hard X-ray and {gamma -ray} spectra of clusters (e.g. INTEGRAL) can determine the contribution of the energetic lepton component generated by supersonic halo motions to the observed nonthermal emission, thus constraining the energetic nuclear component.

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