Looking for something fun to consider today? Try this on for size: what happens to life on Earth if a gamma-ray burst points at us from within our own galaxy?
An array of cosmic ray telescopes in western Utah is determining the origin of the most energetic particles in the Universe.
In this article, the authors measure the cosmic ray ionization rate within a few parsecs of the galactic center. They find that the cosmic ray ionization rate is an order of magnitude larger than the galactic standard and also that the molecular gas near the galactic center is much warmer than the typical galactic molecular cloud.
Voids in the cosmic web are observed to be contain large-scale magnetic fields … but it’s unclear how this happens. In this paper, the authors suggest two possible explanations.
This paper discusses the propagation characteristics of cosmic-ray electrons and nuclei in 30 Doradus as well as the Large Magellanic Cloud. Two major correlations are found. For 30 Doradus there is a correlation between the radio and infrared emission. For the LMC there is a link between the cosmic ray electron propagation length with the star formation rate.
N. Prantzos investigates whether the bulk of Galactic cosmic rays can be accounted for by supernovae remnants
The Fermi Large Area Telescope used a clever method of splitting electrons and positrons via the Earth’s magnetic field to show that there’s a significant excess of cosmic ray positrons at high energies – much more than can be explained using known cosmic ray processes.
Ultra-high energy cosmic rays may be produced via shock acceleration. This paper presents theoretical upper limits on the energies of the cosmic rays that can be produced in this way, providing a means of testing this theory.