TL;DR
IceCube is a large neutrino detector with upgrades aimed at exploring cosmic ray sources and particle physics, but the origins of extragalactic cosmic rays remain largely unknown, with some promising nearby galaxy candidates.
Contribution
This paper reviews the current status, scientific potential, and astrophysical implications of IceCube and its upgrade Deep Core in neutrino detection and cosmic ray source identification.
Findings
IceCube has achieved significant progress in neutrino detection.
The origin of extragalactic cosmic rays remains unresolved.
Nearby active galaxies are potential sources of cosmic rays.
Abstract
We discuss the status of the kilometer-scale neutrino detector IceCube and its low energy upgrade Deep Core and review its scientific potential for particle physics. We subsequently appraise IceCube's potential for revealing the enigmatic sources of cosmic rays. After all, this aspiration set the scale of the instrument. While only a smoking gun is missing for the case that the Galactic component of the cosmic ray spectrum originates in supernova remnants, the origin of the extragalactic component remains as inscrutable as ever. We speculate on the role of the nearby active galaxies Centaurus A and M87.
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