no code implementations • 11 Jul 2019 • Christopher S. Reynolds, M. C. David Marsh, Helen R. Russell, Andrew C. Fabian, Robyn N. Smith, Francesco Tombesi, Sylvain Veilleux
We compute photon survival probabilities as a function of ALP mass $m_a$ and ALP-photon coupling constant $g_{a\gamma}$ for an ensemble of ICM magnetic field models, and then use the NGC1275 spectrum to constraint the $(m_a, g_{a\gamma})$-plane.
High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena
no code implementations • 8 May 2018 • Theodor Bjorkmo, M. C. David Marsh
In this work, we show how that problem can be completely circumvented for the local Taylor coefficients of a Gaussian random field with a Gaussian (or `square exponential') covariance function.
no code implementations • 21 Mar 2017 • M. C. David Marsh, Helen R. Russell, Andrew C. Fabian, Brian R. McNamara, Paul Nulsen, Christopher S. Reynolds
Axion-like particles (ALPs) and photons can quantum mechanically interconvert when propagating through magnetic fields, and ALP-photon conversion may induce oscillatory features in the spectra of astrophysical sources.
High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena