Energetic Particles in Halos of Star Forming Galaxies
arXiv:1904.01997 · doi:10.1093/mnras/stz963
Abstract
Quantitative modeling of the spectro-spatial distributions of energetic electrons and protons in galactic halos is needed in order to determine their interactions with the local plasma and radiation fields, and also to estimate their residual spectral densities in intracluster and intergalactic environments. We develop a semi-analytic approach for calculating the particle distributions in the halo based on a detailed diffusion model for particle propagation from acceleration sites and interactions in the galactic disk. Important overall normalization of our models is based on results from detailed modeling in the Galactic disk with the GALPROP code. This provides the essential input for determining particle distributions in the outer disk, which are used as source terms for calculating the distributions in the extensive halo for a range of values of key parameters affecting energy losses and propagation mode. Our modeling approach is applied to the two edge-on star-forming galaxies NGC 4631 and NGC 4666, for which recent mapping of radio emission in the inner halo provides the required overall normalization. We predict the levels and spatial profiles of radio, X-ray, and gamma-ray emission in the halos of these galaxies. Our quantitative modeling enables us to estimate the total calorimetric efficiencies of electrons and protons in star-forming galaxies, and to predict their residual spectral distributions in the outer halo and intergalactic space.
arXiv comment12 pages, 4 figures
References in corpus (17)
- Energy spectra of gamma-rays, electrons and neutrinos produced at proton-proton interactions in the very high energy regime
- X-ray emission from star-forming galaxies - I. High-mass X-ray binaries
- GeV Observations of Star-forming Galaxies with \textit{Fermi} LAT
- Localization and broadband follow-up of the gravitational-wave transient GW150914
- Global cosmic-ray related luminosity and energy budget of the Milky Way
- Galactic synchrotron emission with cosmic ray propagation models
- Fermi Large Area Telescope View of the Core of the Radio Galaxy Centaurus A
- CHANG-ES IV: Radio continuum emission of 35 edge-on galaxies observed with the Karl G. Jansky Very Large Array in D-configuration, Data Release 1
- High energy gamma-ray emission from the starburst nucleus of NGC 253
- Multi-messenger model for the starburst galaxy M82
- Radio haloes in nearby galaxies modelled with 1D cosmic-ray transport using SPINNAKER
- Fermi Large Area Telescope Detection of Extended Gamma-Ray Emission from the Radio Galaxy Fornax A
- High Energy Emission from the Starburst Galaxy NGC253
- Modelling of the Spectral Energy Distribution of Fornax A: Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes
- Search for gamma-ray emission from star-forming galaxies with Fermi LAT
- Implications on Spatial Models of Interstellar Gamma-Ray Inverse-Compton Emission from Synchrotron Emission Studies in Radio and Microwaves
- Galactic Energetic Particles and Their Radiative Yields in Clusters