The Effect of a Non-Thermal Tail on the Sunyaev-Zeldovich Effect in clusters of galaxies

Details The Effect of a Non-Thermal Tail on the Sunyaev-Zeldovich Effect in clusters of galaxies The Effect of a Non-Thermal Tail on the Sunyaev-Zeldovich Effect in clusters of galaxies

2000-01-26

arxiv.org/abs/astro-ph/0001471v2

Astrophys.J.535:L71,2000

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, version to be published in ApJ. Lett

Scientific paper

10.1086/312706

We study the spectral distortions of the cosmic microwave background radiation induced by the Sunyaev-Zel'dovich (SZ) effect in clusters of galaxies when the target electrons have a modified Maxwell-Boltzmann distribution with a high-energy non-thermal tail. Bremsstrahlung radiation from this type of \\ electron distribution may explain the supra-thermal X-ray emission observed in some clusters such as the Coma cluster and A2199 and serve as an alternative to the classical but problematic inverse Compton scattering interpretation. We show that the SZ effect can be used as a powerful tool to probe the electron distribution in clusters of galaxies and discriminate among these different interpretations of the X-ray excess. The existence of a non-thermal tail can have important consequences for cluster based estimators of cosmological parameters.

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