Lunar detection of ultra-high-energy cosmic rays and neutrinos with the square kilometre array
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The origin of the most energetic particles in nature, the ultra-high-energy (UHE) cosmic rays, is still a mystery. Only the most energetic of these have sufficiently small angular deflections to be used for directional studies, and their flux is so low that even the 3,000 km2 Pierre Auger detector registers only about 30 cosmic rays per year of these energies. A method to provide an even larger aperture is to use the lunar Askaryan technique, in which ground-based radio telescopes search for the nanosecond radio flashes produced when a cosmic ray interacts with the Moon's surface. The technique is also sensitive to UHE neutrinos, which may be produced in the decays of topological defects from the early universe. Observations with existing radio telescopes have shown that this technique is technically feasible, and established the required procedure: The radio signal should be searched for pulses in real time, compensating for ionospheric dispersion and filtering out local radio interference, and candidate events stored for later analysis. For the Square Kilometre Array (SKA), this requires the formation of multiple tied-array beams, with high time resolution, covering the Moon, with either SKA1- LOWor SKA1-MID.With its large collecting area and broad bandwidth, the SKA will be able to detect the known flux of UHE cosmic rays using the visible lunar surface - millions of square km - as the detector, providing sufficient detections of these extremely rare particles to address the mystery of their origin. Advancing.
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Ekers, Ronald (2014)© 2013 Elsevier B.V. All rights reserved. This presentation starts with Karl Jansky's discovery of cosmic radio emission in 1933 and notes the striking similarities to Hess's discovery of cosmic-rays in 1912. At first it ...
Smolcic, V.; Padovani, P.; Delhaize, J.; Prandoni, I.; Seymour, Nick; Jarvis, M.; Afonso, J.; Magliocchett, M.; Huynh, I.; Vaccari, M.; Karim, A. (2014)In this Chapter we present the motivation for undertaking both a wide and deep survey with the SKA in the context of studying AGN activity across cosmic time. With an rms down to 1 µJy/beam at 1 GHz over 1,000 - 5,000 ...
The VLA-COSMOS 3 GHz Large Project: The infrared-radio correlation of star-forming galaxies and AGN to z ? 6Delhaize, J.; Smolcic, V.; Delvecchio, I.; Novak, M.; Sargent, M.; Baran, N.; Magnelli, B.; Zamorani, G.; Schinnerer, E.; Murphy, E.; Aravena, M.; Berta, S.; Bondi, M.; Capak, P.; Carilli, C.; Ciliegi, P.; Civano, F.; Ilbert, O.; Karim, A.; Laigle, C.; Le Fèvre, O.; Marchesi, S.; McCracken, H.; Salvato, M.; Seymour, Nick; Tasca, L. (2017)© ESO, 2017. We examine the behaviour of the infrared-radio correlation (IRRC) over the range 0 < z ? 6 using new, highly sensitive 3 GHz observations with the Karl G. Jansky Very Large Array (VLA) and infrared data from ...