PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
Modelling the gamma-ray emission from Eta Carinae
R.ย Walter* and M.ย Balbo
Full text: pdf
Pre-published on: July 25, 2023
Published on: โ€”
After the detection by the H.E.S.S. Cherenkov telescope of the very-high-energy ๐›พ rays coming from the colliding wind binary ๐œ‚ Carinae, we explored the possibility that its spectral cut-off is not due to an intrinsic cut-off in the accelerated particle population, but rather being a feature arising from the ๐›พ-๐›พ opacity. We developed a model which reproduces the expected ๐›พ-๐›พ absorption between the very-high-energy ๐›พ rays interacting with the intense ultraviolet fields of both stars, assuming the two most likely orbital orientations. Thanks to its deep sensitivity, the Cherenkov Telescope Array (CTA) has the potential to exclude one of the two orientations detecting fast spectral variability on daily/weekly timescale, when at periastron the orbital positions of the two stars vary the most. It can also constrain the magnetic field and the spatial locations where particles are accelerated to their highest energy via diffusive shock acceleration. The eventual detection by CTA of a rising spectrum due to the Rayleigh-Taylor tail of the absorption will be the indisputable confirmation that colliding wind binaries can accelerate particles to energies larger than those one found in supernova remnants.
DOI: https://doi.org/10.22323/1.444.0909
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.