2017/05/15 by T. Dzhatdoev, Dzhatdoev, T. A.
Computer Science · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Computational Physics and Python Applications #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE)
paper · pdf · doi:10.48550/arxiv.1705.05360
openalex publication_date 2017/05/15 · openalex created_date 2019/07/30 · openalex updated_date 2026/07/28
Recent progress in very high energy (VHE, E >100 GeV) γ-ray observations, together with advances in the extragalactic background light (EBL) modelling, allows to search for new phenomena such as γ-axion-like particle (γ→ ALP) oscillation and to explore the extragalactic magnetic field (EGMF) strength and structure. These studies are usually performed by searching for some deviation from the so-called absorption-only model, that accounts for only primary photon absorption on the EBL and adiabatic losses. In fact, there exist several indications that the absorption-only model is incomplete. We present and discuss the intergalactic electromagnetic cascade model (IECM) --- the simplest model that allows to coherently explain all known anomalies. This model has a number of robust signatures that could be searched for with present and future instruments. The IECM model may serve as a new background template, allowing to make future searches for γ→ ALP oscillation more robust. A detailed account of our calculations is available in astro-ph/1609.01013v2 (A&A,in print).