This paper considers the suitability of a number of emerging and future instruments for the study of radio recombination lines (RRLs) at frequencies below 200 MHz. These lines are of interest because they arise only in low-density regions of the ionized interstellar medium and because they may represent a frequency-dependent foreground for next-generation experiments trying to detect H-i signals from the Universe's Epoch of Reionization and Dark Ages (so-called 21-cm ...
Galaxy clusters are the largest gravitationally bound systems in the Universe and their interactions via collisions and mergers are the most energetic events since the Big Bang. The gas in these systems is mixed with magnetic fields and relativistic particles, creating diffuse, megaparsec-scale synchrotron radiation at the cluster center which can be observed at radio wavelengths. Currently detected in only a fraction of known interacting clusters, this emission is called ...
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