Energetic particles in the central starburst, disc, and halo of NGC253

Yoel Rephaeli*, Sharon Sadeh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Detailed modelling of the spectro-spatial distributions of energetic electrons and protons in galactic discs and haloes of starburst galaxies (SBGs) is needed in order to follow their interactions with the magnetized interstellar medium and radiation fields, determine their radiative yields, and for estimating their residual spectral densities in intergalactic environments. We have developed a semi-analytical approach for calculating the particle spectro-spatial distributions in the disc and halo based on a diffusion model for particle propagation from acceleration sites in the central SB and disc regions, including all their relevant interaction modes. Important overall normalization of our models is based on previous modelling of the Galactic disc (with the GALPROP code), scaled to the higher star-formations rate in NGC253, and on spatially resolved radio measurements of the central SB and disc. These provide the essential input for determining the particle distributions and their predicted radiative yields in the outer disc and inner halo for a range of values of the key parameters that affect diffusion rate and energy losses. Results of our work clearly indicate that quantitative description of non-thermal emission in SBGs has to be based on modelling of the particle distributions in the entire disc, not just the central SB region.

Original languageEnglish
Pages (from-to)1596-1603
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - 1 Feb 2024


FundersFunder number
Joan and Irwin Jacobs
Jeffrey Cheah Foundation


    • cosmic rays
    • galaxies: haloes
    • gamma-rays: galaxies
    • radio continuum: galaxies


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