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Recent selected publications

See my ORCiD profile and ADS for full publication list. Some recent highlighted papers are below.

Ultra high-energy cosmic rays from beyond the Greisen-Zatsepin-Kuz'min horizon

To appear in the Astrophysical Journal

A study investigating where the sources of the highest energy particles in our Universe originate from. We find more than half of the detected cosmic rays on Earth, at ultra high-energies originate from a large number of distant source populations. Much of the flux has been attenuated by the CMB and extra-galactic background light, but the residual still can produce a strong background component.

Characterizing the signatures of star-forming galaxies in the extragalactic γ-ray background

Published in Monthly Notices of the Royal Astronomical Society; Volume 506, Issue 1, pp.52-72

In this work, we modelled the contribution distant populations of star-forming galaxies could make to the isotropic gamma-ray background. We show that the dust and the extra-galactic background light are important factors in determining the spectrum observed, but can be well described by simple parameterised models. We further demonstrate how anisotropies can be used to reveal new insights into characteristics of star-forming galaxies as an unresolved source population in the gamma-ray background.

Observational signatures of cosmic ray interactions in molecular clouds

Published in the Astrophysical Journal; Volume 913, Issue 1, id.52, pp. 25

We introduce a new method to assess the propagation of cosmic rays in molecular cloud complexes, using information derived from polarised dust emission/absorption signatures from these regions (which presumably trace local magnetic field structures). We apply our method to the IC 5146 molecular cloud complex in Cygnus, to derive effective cosmic ray propagation parameters, and discuss the associated cosmic ray driving heating and ionisation patterns they may cause in this region, as well as their observational signatures.