APC colloquium

Radio Supernova remnants: Echoes of stellar explosions

Supernova remnants (SNRs), the relics of stellar explosions, are among the most significant sources of non-thermal radio emission in the universe. As the shock fronts created by the supernova expand, they compress and distort the ambient matter and magnetic fields, producing energetic particles via diffusive shock acceleration. This talk undertakes a journey to uncover the multifaceted nature of SNRs through the lens of radio astronomy.

Astrophysical Tau Neutrinos and Other Recent Results from the IceCube Neutrino Observatory

Neutrinos are very reticent fundamental particles. Tau neutrinos make electron and muon neutrinos look positively gregarious.  The IceCube Neutrino Observatory at the South Pole has sensitivity to all three active neutrino flavors over an energy scale spanning six orders of magnitude.  We report on recent results from the experiment, including the first high-significance measurement of the most energetic tau neutrino candidates ever observed.

The Extragalactic Multi-Messenger Spectrum: Lessons From Propagation of Astroparticles

Our understanding of the radiation record of the universe has advanced dramatically over the past ten years. The brightness of the extragalactic sky is now measured in photons, neutrinos and cosmic rays by observatories on the ground, in the depths of the sea and ice, by satellites orbiting the Earth, and by probes at the edge of the solar system.

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