Evidence for γ-ray emission from the remnant of Kepler’s supernova based on deep H.E.S.S. observations⋆
Astronomy & Astrophysics EDP Sciences 662 (2022) a65
Time-resolved hadronic particle acceleration in the recurrent nova RS Ophiuchi
Science American Association for the Advancement of Science (AAAS) 376:6588 (2022) 77-80
Time-resolved hadronic particle acceleration in the recurrent Nova RS Ophiuchi
(2022)
Relevance of photon-photon dispersion within the jet for blazar axionlike particle searches
Physical Review D American Physical Society 105:2 (2022) 23017
Abstract:
Axionlike particles (ALPs) could mix with photons in the presence of astrophysical magnetic fields. Searching for this effect in gamma-ray observations of blazars has provided some of the strongest constraints on ALP parameter space so far. Previously, photon-photon dispersion of gamma rays off of the cosmic microwave background has been shown to be important for these calculations and is universally included in ALP-photon mixing models. Here, we assess the effects of dispersion off of other photon fields within the blazar (produced by the accretion disk, the broad line region, the dust torus, starlight, and the synchrotron field) by modeling the jet and fields of the flat spectrum radio quasar 3C454.3 and propagating ALPs through the model both with and without the full dispersion calculation. We find that the full dispersion calculation can strongly affect the mixing, particularly at energies above 100 GeV—often reducing the ALP-photon conversion probability. This could have implications for future searches planned with, e.g., the Cherenkov Telescope Array, particularly those looking for a reduced opacity of the Universe at the highest energies.Observation of the gamma-ray binary HESS J0632+057 with the HESS, MAGIC, and VERITAS telescopes
Astrophysical Journal IOP Publishing 923:2 (2021) 241