Non-thermal infrared emission - a unique window on radio galaxy lobes

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Scientific paper

Powerful radio galaxies play an essential role in the dynamics and thermodynamics of the intracluster medium. Fundamental questions exist, however, about their energy budget - how much energy is transferred and how they apparently distribute it uniformly. High sensitivity Spitzer observations offer a unique and critical tool for probing the energetics of lobes of radio galaxies and the physics of the relativistic particle acceleration process. The work on e.g. M87 has already shown that the energy going into particle acceleration may seriously affect the amount available for heating the external medium. In this last cold cycle, it is critical to establish whether this is a common phenomenon in radio galaxy lobes, spanning a range of morphologies as in our targets, or whether this is simply another special feature of M87. In order to achieve this goal we here propose to obtain deep IRAC observations of six radio galaxies with exceptionally bright and highly structured radio lobes.

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